This reverts commit 05677165.

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

- FileFinder.h
- FileTools.h
- TimeMeasurementBase.h
- quicksort.h

changes due to namespace changes in:
- PointVec.cpp
- Polygon.cpp
- AdjMat.cpp
- CRSMatrixReordered.cpp

in order to make the name of libraries, namespaces and directories more consistent the Base directory is know named BaseLib

added more documentation to quicksort
added class CRSMatrixReordered
first version of nested dissection based on metis is now working

added another version of quicksort algorithm
corrected documentation in class SparseMatrixBase

- 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