Remove c++11-off CI jobs.

This is step 1 in preparing to transition beyond c++03.
diff --git a/ci/README.md b/ci/README.md
index 8395b16..a5599cc 100644
--- a/ci/README.md
+++ b/ci/README.md
@@ -9,17 +9,11 @@
 
 | Job Name                                 | Arch      | OS             | Compiler   | C++11   |
 |------------------------------------------|-----------|----------------|------------|---------|
-| `build:x86-64:linux:gcc-4.8:cxx11-off`   | `x86-64`  | `Ubuntu 18.04` | `GCC-4.8`  | `Off`   |
 | `build:x86-64:linux:gcc-4.8:cxx11-on`    | `x86-64`  | `Ubuntu 18.04` | `GCC-4.8`  | `On`    |
-| `build:x86-64:linux:gcc-9:cxx11-off`     | `x86-64`  | `Ubuntu 18.04` | `GCC-9`    | `Off`   |
 | `build:x86-64:linux:gcc-9:cxx11-on`      | `x86-64`  | `Ubuntu 18.04` | `GCC-9`    | `On`    |
-| `build:x86-64:linux:gcc-10:cxx11-off`    | `x86-64`  | `Ubuntu 18.04` | `GCC-10`   | `Off`   |
 | `build:x86-64:linux:gcc-10:cxx11-on`     | `x86-64`  | `Ubuntu 18.04` | `GCC-10`   | `On`    |
-| `build:x86-64:linux:clang-10:cxx11-off`  | `x86-64`  | `Ubuntu 18.04` | `Clang-10` | `Off`   |
 | `build:x86-64:linux:clang-10:cxx11-on`   | `x86-64`  | `Ubuntu 18.04` | `Clang-10` | `On`    |
-| `build:aarch64:linux:gcc-10:cxx11-off`   | `AArch64` | `Ubuntu 18.04` | `GCC-10`   | `Off`   |
 | `build:aarch64:linux:gcc-10:cxx11-on`    | `AArch64` | `Ubuntu 18.04` | `GCC-10`   | `On`    |
-| `build:aarch64:linux:clang-10:cxx11-off` | `AArch64` | `Ubuntu 18.04` | `Clang-10` | `Off`   |
 | `build:aarch64:linux:clang-10:cxx11-on`  | `AArch64` | `Ubuntu 18.04` | `Clang-10` | `On`    |
 
 ### Test stage
@@ -30,27 +24,15 @@
 
 | Job Name                                            | Arch      | OS             | Compiler   | C++11   | Module
 |-----------------------------------------------------|-----------|----------------|------------|---------|--------
-| `test:x86-64:linux:gcc-4.8:cxx11-off:official`      | `x86-64`  | `Ubuntu 18.04` | `GCC-4.8`  | `Off`   | `Official`
-| `test:x86-64:linux:gcc-4.8:cxx11-off:unsupported`   | `x86-64`  | `Ubuntu 18.04` | `GCC-4.8`  | `Off`   | `Unsupported`
 | `test:x86-64:linux:gcc-4.8:cxx11-on:official`       | `x86-64`  | `Ubuntu 18.04` | `GCC-4.8`  | `On`    | `Official`
 | `test:x86-64:linux:gcc-4.8:cxx11-on:unsupported`    | `x86-64`  | `Ubuntu 18.04` | `GCC-4.8`  | `On`    | `Unsupported`
-| `test:x86-64:linux:gcc-9:cxx11-off:official`        | `x86-64`  | `Ubuntu 18.04` | `GCC-9`    | `Off`   | `Official`
-| `test:x86-64:linux:gcc-9:cxx11-off:unsupported`     | `x86-64`  | `Ubuntu 18.04` | `GCC-9`    | `Off`   | `Unsupported`
 | `test:x86-64:linux:gcc-9:cxx11-on:official`         | `x86-64`  | `Ubuntu 18.04` | `GCC-9`    | `On`    | `Official`
 | `test:x86-64:linux:gcc-9:cxx11-on:unsupported`      | `x86-64`  | `Ubuntu 18.04` | `GCC-9`    | `On`    | `Unsupported`
-| `test:x86-64:linux:gcc-10:cxx11-off:official`       | `x86-64`  | `Ubuntu 18.04` | `GCC-10`   | `Off`   | `Official`
-| `test:x86-64:linux:gcc-10:cxx11-off:unsupported`    | `x86-64`  | `Ubuntu 18.04` | `GCC-10`   | `Off`   | `Unsupported`
 | `test:x86-64:linux:gcc-10:cxx11-on:official`        | `x86-64`  | `Ubuntu 18.04` | `GCC-10`   | `On`    | `Official`
 | `test:x86-64:linux:gcc-10:cxx11-on:unsupported`     | `x86-64`  | `Ubuntu 18.04` | `GCC-10`   | `On`    | `Unsupported`
-| `test:x86-64:linux:clang-10:cxx11-off:official`     | `x86-64`  | `Ubuntu 18.04` | `Clang-10` | `Off`   | `Official`
-| `test:x86-64:linux:clang-10:cxx11-off:unsupported`  | `x86-64`  | `Ubuntu 18.04` | `Clang-10` | `Off`   | `Unsupported`
 | `test:x86-64:linux:clang-10:cxx11-on:official`      | `x86-64`  | `Ubuntu 18.04` | `Clang-10` | `On`    | `Official`
 | `test:x86-64:linux:clang-10:cxx11-on:unsupported`   | `x86-64`  | `Ubuntu 18.04` | `Clang-10` | `On`    | `Unsupported`
-| `test:aarch64:linux:gcc-10:cxx11-off:official`      | `AArch64` | `Ubuntu 18.04` | `GCC-10`   | `Off`   | `Official`
-| `test:aarch64:linux:gcc-10:cxx11-off:unsupported`   | `AArch64` | `Ubuntu 18.04` | `GCC-10`   | `Off`   | `Unsupported`
 | `test:aarch64:linux:gcc-10:cxx11-on:official`       | `AArch64` | `Ubuntu 18.04` | `GCC-10`   | `On`    | `Official`
 | `test:aarch64:linux:gcc-10:cxx11-on:unsupported`    | `AArch64` | `Ubuntu 18.04` | `GCC-10`   | `On`    | `Unsupported`
-| `test:aarch64:linux:clang-10:cxx11-off:official`    | `AArch64` | `Ubuntu 18.04` | `Clang-10` | `Off`   | `Official`
-| `test:aarch64:linux:clang-10:cxx11-off:unsupported` | `AArch64` | `Ubuntu 18.04` | `Clang-10` | `Off`   | `Unsupported`
 | `test:aarch64:linux:clang-10:cxx11-on:official`     | `AArch64` | `Ubuntu 18.04` | `Clang-10` | `On`    | `Official`
 | `test:aarch64:linux:clang-10:cxx11-on:unsupported`  | `AArch64` | `Ubuntu 18.04` | `Clang-10` | `On`    | `Unsupported`
diff --git a/ci/build.gitlab-ci.yml b/ci/build.gitlab-ci.yml
index 1144419..213ec50 100644
--- a/ci/build.gitlab-ci.yml
+++ b/ci/build.gitlab-ci.yml
@@ -24,17 +24,6 @@
 
 ######## x86-64 ################################################################
 # GCC-4.8 (the oldest compiler we support)
-build:x86-64:linux:gcc-4.8:cxx11-off:
-  extends: .build:linux:base
-  variables:
-    EIGEN_CI_CXX_COMPILER: "g++-4.8"
-    EIGEN_CI_CC_COMPILER: "gcc-4.8"
-    EIGEN_TEST_CXX11: "off"
-  tags:
-    - eigen-runner
-    - linux
-    - x86-64
-
 build:x86-64:linux:gcc-4.8:cxx11-on:
   extends: .build:linux:base
   variables:
@@ -47,17 +36,6 @@
     - x86-64
 
 # GCC-9
-build:x86-64:linux:gcc-9:cxx11-off:
-  extends: .build:linux:base
-  variables:
-    EIGEN_CI_CXX_COMPILER: "g++-9"
-    EIGEN_CI_CC_COMPILER: "gcc-9"
-    EIGEN_TEST_CXX11: "off"
-  tags:
-    - eigen-runner
-    - linux
-    - x86-64
-
 build:x86-64:linux:gcc-9:cxx11-on:
   extends: .build:linux:base
   variables:
@@ -70,17 +48,6 @@
     - x86-64
 
 # GCC-10
-build:x86-64:linux:gcc-10:cxx11-off:
-  extends: .build:linux:base
-  variables:
-    EIGEN_CI_CXX_COMPILER: "g++-10"
-    EIGEN_CI_CC_COMPILER: "gcc-10"
-    EIGEN_TEST_CXX11: "off"
-  tags:
-    - eigen-runner
-    - linux
-    - x86-64
-
 build:x86-64:linux:gcc-10:cxx11-on:
   extends: .build:linux:base
   variables:
@@ -93,17 +60,6 @@
     - x86-64
 
 # Clang-10
-build:x86-64:linux:clang-10:cxx11-off:
-  extends: .build:linux:base
-  variables:
-    EIGEN_CI_CXX_COMPILER: "clang++-10"
-    EIGEN_CI_CC_COMPILER: "clang-10"
-    EIGEN_TEST_CXX11: "off"
-  tags:
-    - eigen-runner
-    - linux
-    - x86-64
-
 build:x86-64:linux:clang-10:cxx11-on:
   extends: .build:linux:base
   variables:
@@ -117,17 +73,6 @@
 
 ######## AArch64 ###############################################################
 # GCC-10
-build:aarch64:linux:gcc-10:cxx11-off:
-  extends: .build:linux:base
-  variables:
-    EIGEN_CI_CXX_COMPILER: "g++-10"
-    EIGEN_CI_CC_COMPILER: "gcc-10"
-    EIGEN_TEST_CXX11: "off"
-  tags:
-    - eigen-runner
-    - linux
-    - aarch64
-
 build:aarch64:linux:gcc-10:cxx11-on:
   extends: .build:linux:base
   variables:
@@ -140,17 +85,6 @@
     - aarch64
 
 # Clang-10
-build:aarch64:linux:clang-10:cxx11-off:
-  extends: .build:linux:base
-  variables:
-    EIGEN_CI_CXX_COMPILER: "clang++-10"
-    EIGEN_CI_CC_COMPILER: "clang-10"
-    EIGEN_TEST_CXX11: "off"
-  tags:
-    - eigen-runner
-    - linux
-    - aarch64
-
 build:aarch64:linux:clang-10:cxx11-on:
   extends: .build:linux:base
   variables:
@@ -166,18 +100,6 @@
 # Currently all ppc64le jobs are allowed to fail
 
 # GCC-10
-build:ppc64le:linux:gcc-10:cxx11-off:
-  extends: .build:linux:base
-  variables:
-    EIGEN_CI_CXX_COMPILER: "g++-10"
-    EIGEN_CI_CC_COMPILER: "gcc-10"
-    EIGEN_TEST_CXX11: "off"
-    EIGEN_CI_ADDITIONAL_ARGS: "-DCMAKE_CXX_FLAGS='-DEIGEN_ALTIVEC_DISABLE_MMA'"
-  tags:
-    - eigen-runner
-    - linux
-    - ppc64le
-
 build:ppc64le:linux:gcc-10:cxx11-on:
   allow_failure: true
   extends: .build:linux:base
@@ -190,19 +112,7 @@
     - linux
     - ppc64le
 
-# # Clang-10
-build:ppc64le:linux:clang-10:cxx11-off:
-  allow_failure: true
-  extends: .build:linux:base
-  variables:
-    EIGEN_CI_CXX_COMPILER: "clang++-10"
-    EIGEN_CI_CC_COMPILER: "clang-10"
-    EIGEN_TEST_CXX11: "off"
-  tags:
-    - eigen-runner
-    - linux
-    - ppc64le
-
+# Clang-10
 build:ppc64le:linux:clang-10:cxx11-on:
   allow_failure: true
   extends: .build:linux:base
diff --git a/ci/smoketests.gitlab-ci.yml b/ci/smoketests.gitlab-ci.yml
index 6384f10..8533331 100644
--- a/ci/smoketests.gitlab-ci.yml
+++ b/ci/smoketests.gitlab-ci.yml
@@ -22,13 +22,6 @@
   only:
     - merge_requests
 
-buildsmoketests:x86-64:linux:gcc-10:cxx11-off:
-  extends: .buildsmoketests:linux:base
-  variables:
-    EIGEN_CI_CXX_COMPILER: "g++-10"
-    EIGEN_CI_CC_COMPILER: "gcc-10"
-    EIGEN_TEST_CXX11: "off"
-
 buildsmoketests:x86-64:linux:gcc-10:cxx11-on:
   extends: .buildsmoketests:linux:base
   variables:
@@ -36,13 +29,6 @@
     EIGEN_CI_CC_COMPILER: "gcc-10"
     EIGEN_TEST_CXX11: "on"
 
-buildsmoketests:x86-64:linux:clang-10:cxx11-off:
-  extends: .buildsmoketests:linux:base
-  variables:
-    EIGEN_CI_CXX_COMPILER: "clang++-10"
-    EIGEN_CI_CC_COMPILER: "clang-10"
-    EIGEN_TEST_CXX11: "off"
-
 buildsmoketests:x86-64:linux:clang-10:cxx11-on:
   extends: .buildsmoketests:linux:base
   variables:
@@ -78,13 +64,6 @@
   only:
     - merge_requests
 
-smoketests:x86-64:linux:gcc-10:cxx11-off:
-  extends: .smoketests:linux:base
-  variables:
-    EIGEN_CI_CXX_COMPILER: g++-10
-    EIGEN_CI_CC_COMPILER: gcc-10
-  needs: [ "buildsmoketests:x86-64:linux:gcc-10:cxx11-off" ]
-
 smoketests:x86-64:linux:gcc-10:cxx11-on:
   extends: .smoketests:linux:base
   variables:
@@ -92,13 +71,6 @@
     EIGEN_CI_CC_COMPILER: gcc-10
   needs: [ "buildsmoketests:x86-64:linux:gcc-10:cxx11-on" ]
 
-smoketests:x86-64:linux:clang-10:cxx11-off:
-  extends: .smoketests:linux:base
-  variables:
-    EIGEN_CI_CXX_COMPILER: clang++-10
-    EIGEN_CI_CC_COMPILER: clang-10
-  needs: [ "buildsmoketests:x86-64:linux:clang-10:cxx11-off" ]
-
 smoketests:x86-64:linux:clang-10:cxx11-on:
   extends: .smoketests:linux:base
   variables:
diff --git a/ci/test.gitlab-ci.yml b/ci/test.gitlab-ci.yml
index 2a0f5dd..3525ae9 100644
--- a/ci/test.gitlab-ci.yml
+++ b/ci/test.gitlab-ci.yml
@@ -29,27 +29,6 @@
 
 ##### x86-64 ###################################################################
 # GCC-4.8
-.test:x86-64:linux:gcc-4.8:cxx11-off:
-  extends: .test:linux:base
-  variables:
-    EIGEN_CI_CXX_COMPILER: g++-4.8
-    EIGEN_CI_CC_COMPILER: gcc-4.8
-  needs: [ "build:x86-64:linux:gcc-4.8:cxx11-off" ]
-  tags: 
-    - eigen-runner
-    - linux
-    - x86-64
-
-test:x86-64:linux:gcc-4.8:cxx11-off:official:
-  extends: .test:x86-64:linux:gcc-4.8:cxx11-off
-  variables:
-    EIGEN_CI_TEST_LABEL: "Official"
-
-test:x86-64:linux:gcc-4.8:cxx11-off:unsupported:
-  extends: .test:x86-64:linux:gcc-4.8:cxx11-off
-  variables:
-    EIGEN_CI_TEST_LABEL: "Unsupported"
-
 .test:x86-64:linux:gcc-4.8:cxx11-on:
   extends: .test:linux:base
   variables:
@@ -72,27 +51,6 @@
     EIGEN_CI_TEST_LABEL: "Unsupported"
 
 # GCC-9
-.test:x86-64:linux:gcc-9:cxx11-off:
-  extends: .test:linux:base
-  variables:
-    EIGEN_CI_CXX_COMPILER: g++-9
-    EIGEN_CI_CC_COMPILER: gcc-9
-  needs: [ "build:x86-64:linux:gcc-9:cxx11-off" ]
-  tags: 
-    - eigen-runner
-    - linux
-    - x86-64
-
-test:x86-64:linux:gcc-9:cxx11-off:official:
-  extends: .test:x86-64:linux:gcc-9:cxx11-off
-  variables:
-    EIGEN_CI_TEST_LABEL: "Official"
-
-test:x86-64:linux:gcc-9:cxx11-off:unsupported:
-  extends: .test:x86-64:linux:gcc-9:cxx11-off
-  variables:
-    EIGEN_CI_TEST_LABEL: "Unsupported"
-
 .test:x86-64:linux:gcc-9:cxx11-on:
   extends: .test:linux:base
   variables:
@@ -115,28 +73,6 @@
     EIGEN_CI_TEST_LABEL: "Unsupported"
 
 # GCC-10
-.test:x86-64:linux:gcc-10:cxx11-off:
-  extends: .test:linux:base
-  variables:
-    EIGEN_CI_CXX_COMPILER: g++-10
-    EIGEN_CI_CC_COMPILER: gcc-10
-  needs: [ "build:x86-64:linux:gcc-10:cxx11-off" ]
-  tags: 
-    - eigen-runner
-    - linux
-    - x86-64
-
-test:x86-64:linux:gcc-10:cxx11-off:official:
-  extends: .test:x86-64:linux:gcc-10:cxx11-off
-  allow_failure: true
-  variables:
-    EIGEN_CI_TEST_LABEL: "Official"
-
-test:x86-64:linux:gcc-10:cxx11-off:unsupported:
-  extends: .test:x86-64:linux:gcc-10:cxx11-off
-  variables:
-    EIGEN_CI_TEST_LABEL: "Unsupported"
-
 .test:x86-64:linux:gcc-10:cxx11-on:
   extends: .test:linux:base
   variables:
@@ -161,27 +97,6 @@
     EIGEN_CI_TEST_LABEL: "Unsupported"
 
 # Clang 10
-.test:x86-64:linux:clang-10:cxx11-off:
-  extends: .test:linux:base
-  variables:
-    EIGEN_CI_CXX_COMPILER: clang++-10
-    EIGEN_CI_CC_COMPILER: clang-10
-  needs: [ "build:x86-64:linux:clang-10:cxx11-off" ]
-  tags: 
-    - eigen-runner
-    - linux
-    - x86-64
-
-test:x86-64:linux:clang-10:cxx11-off:official:
-  extends: .test:x86-64:linux:clang-10:cxx11-off
-  variables:
-    EIGEN_CI_TEST_LABEL: "Official"
-
-test:x86-64:linux:clang-10:cxx11-off:unsupported:
-  extends: .test:x86-64:linux:clang-10:cxx11-off
-  variables:
-    EIGEN_CI_TEST_LABEL: "Unsupported"
-
 .test:x86-64:linux:clang-10:cxx11-on:
   extends: .test:linux:base
   variables:
@@ -205,29 +120,6 @@
 
 ##### AArch64 ##################################################################
 # GCC-10
-.test:aarch64:linux:gcc-10:cxx11-off:
-  extends: .test:linux:base
-  variables:
-    EIGEN_CI_CXX_COMPILER: g++-10
-    EIGEN_CI_CC_COMPILER: gcc-10
-  needs: [ "build:aarch64:linux:gcc-10:cxx11-off" ]
-  tags: 
-    - eigen-runner
-    - linux
-    - aarch64
-
-test:aarch64:linux:gcc-10:cxx11-off:official:
-  extends: .test:aarch64:linux:gcc-10:cxx11-off
-  allow_failure: true
-  variables:
-    EIGEN_CI_TEST_LABEL: "Official"
-
-test:aarch64:linux:gcc-10:cxx11-off:unsupported:
-  extends: .test:aarch64:linux:gcc-10:cxx11-off
-  allow_failure: true
-  variables:
-    EIGEN_CI_TEST_LABEL: "Unsupported"
-
 .test:aarch64:linux:gcc-10:cxx11-on:
   extends: .test:linux:base
   variables:
@@ -252,28 +144,6 @@
     EIGEN_CI_TEST_LABEL: "Unsupported"
 
 # Clang 10
-.test:aarch64:linux:clang-10:cxx11-off:
-  extends: .test:linux:base
-  variables:
-    EIGEN_CI_CXX_COMPILER: clang++-10
-    EIGEN_CI_CC_COMPILER: clang-10
-  needs: [ "build:aarch64:linux:clang-10:cxx11-off" ]
-  tags: 
-    - eigen-runner
-    - linux
-    - aarch64
-
-test:aarch64:linux:clang-10:cxx11-off:official:
-  extends: .test:aarch64:linux:clang-10:cxx11-off
-  allow_failure: true
-  variables:
-    EIGEN_CI_TEST_LABEL: "Official"
-
-test:aarch64:linux:clang-10:cxx11-off:unsupported:
-  extends: .test:aarch64:linux:clang-10:cxx11-off
-  variables:
-    EIGEN_CI_TEST_LABEL: "Unsupported"
-
 .test:aarch64:linux:clang-10:cxx11-on:
   extends: .test:linux:base
   variables:
@@ -298,28 +168,6 @@
 
 ##### ppc64le ##################################################################
 # GCC-10
-.test:ppc64le:linux:gcc-10:cxx11-off:
-  extends: .test:linux:base
-  variables:
-    EIGEN_CI_CXX_COMPILER: g++-10
-    EIGEN_CI_CC_COMPILER: gcc-10
-  needs: [ "build:ppc64le:linux:gcc-10:cxx11-off" ]
-  allow_failure: true
-  tags: 
-    - eigen-runner
-    - linux
-    - ppc64le
-
-test:ppc64le:linux:gcc-10:cxx11-off:official:
-  extends: .test:ppc64le:linux:gcc-10:cxx11-off
-  variables:
-    EIGEN_CI_TEST_LABEL: "Official"
-
-test:ppc64le:linux:gcc-10:cxx11-off:unsupported:
-  extends: .test:ppc64le:linux:gcc-10:cxx11-off
-  variables:
-    EIGEN_CI_TEST_LABEL: "Unsupported"
-
 .test:ppc64le:linux:gcc-10:cxx11-on:
   extends: .test:linux:base
   variables:
@@ -342,29 +190,7 @@
   variables:
     EIGEN_CI_TEST_LABEL: "Unsupported"
 
-# # Clang 10
-.test:ppc64le:linux:clang-10:cxx11-off:
-  extends: .test:linux:base
-  variables:
-    EIGEN_CI_CXX_COMPILER: clang++-10
-    EIGEN_CI_CC_COMPILER: clang-10
-  needs: [ "build:ppc64le:linux:clang-10:cxx11-off" ]
-  allow_failure: true
-  tags: 
-    - eigen-runner
-    - linux
-    - ppc64le
-
-test:ppc64le:linux:clang-10:cxx11-off:official:
-  extends: .test:ppc64le:linux:clang-10:cxx11-off
-  variables:
-    EIGEN_CI_TEST_LABEL: "Official"
-
-test:ppc64le:linux:clang-10:cxx11-off:unsupported:
-  extends: .test:ppc64le:linux:clang-10:cxx11-off
-  variables:
-    EIGEN_CI_TEST_LABEL: "Unsupported"
-
+# Clang 10
 .test:ppc64le:linux:clang-10:cxx11-on:
   extends: .test:linux:base
   variables: