Impl. a new algorithm for checking if a point is within a triangle and removed old sources for this task.

refactor rotation functions to seprate functions to compute a rotation matrix and a function to rotate points with a given rotation matrix

For this reason the reworked class template Vector3 is used.

added function rotatePoints() that is applying a 3x3 rotation matrix to the points given within the vector pnts
refactored rotatePointToXY()
added function rotatePointsToXZ()

This reverts commit 05677165.

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

renamed namespace GEOLIB to GeoLib in order to be consistent with other OGS-libraries and directory names

- added test programm for solving a linear system with CG-method
- time measurement is at the moment OS dependent!
- added Base folder
- added GeoLib folder
- added files in MathLib folder - restructured MathLib folder