various fixes in headers

unsupported/Eigen/src/NumericalDiff/NumericalDiff.h

diff --git a/unsupported/Eigen/src/NumericalDiff/NumericalDiff.h b/unsupported/Eigen/src/NumericalDiff/NumericalDiff.h
index f4af943..4a84802 100644
--- a/unsupported/Eigen/src/NumericalDiff/NumericalDiff.h
+++ b/unsupported/Eigen/src/NumericalDiff/NumericalDiff.h
@@ -1,3 +1,6 @@
+// -*- coding: utf-8
+// vim: set fileencoding=utf-8
+
 // This file is part of Eigen, a lightweight C++ template library
 // for linear algebra.
 //
@@ -145,4 +148,6 @@
     Scalar epsfcn;
 };
 
+//vim: ai ts=4 sts=4 et sw=4
 #endif // EIGEN_NUMERICAL_DIFF_H
+