Extend the input to arbitrary TemplatePoint,
but it is working only for TemplatePoint<double, 3>
== Point3d for now.

The lexicographic comparison is now working for
arbitrary TemplatePoint dimensions and underlying
floating types.

The operator is unused. There is a replacement
named LessEq(), which is also taking an epsilon
into account and is used.

The operator is not consistent with the operator<()
for Point3d, because of the epsilon.

into Point3d header file.

This reverts commit 05677165.

Conflicts:
	FileIO/XmlIO/XmlGspInterface.cpp
	README.md

added XmlIO; added FemEnums + Info-objects; added ProjectData; currently compile errors due to changes in PointVec