reorganize header files, split MatrixBase into smaller files.

expose only a few meta-headers to the user, the rest moves to a internal/ subdirectory

test/vectorops.cpp

@@ -23,7 +23,7 @@
 // License. This exception does not invalidate any other reasons why a work
 // based on this file might be covered by the GNU General Public License.
 
-#include"main.h"
+#include "main.h"
 
 template<typename VectorType> void vectorOps(const VectorType& v)
 {