moved functions getFileNameFromPath(), getSuffixFromPath(), copyPathToFileName() and extractPath() from files StringTools.{cpp,h} to files FileTools.{cpp,h}

This reverts commit 27eb90b0.

This should fix #20.

in order to test run time behaviour with contiguous data in memory

added memory usage output

- one for output file name of the new mesh
- another for the maximal collapse distance

- optimized addNeighbor()

[Mesh]
- optimized setNeighborInformationForElements()

- added (a not yet finished version) CollapseMeshNodes programme
- changes in SimpleTests/MeshTests/CMakeLists.txt

[MeshCoarsener]
- new class used by CollapseMeshNodes
- can be used to make mesh nodes unique within a small epsilon radius

[MeshIO]
- added writing functionality for old mesh format

[GeoLib::Grid]
- changed interface (method getPointsWithinCube() -> getVecsOfGridCellsIntersectingCube())
- corrected documentation

[all mesh elements]
- added method clone()
- added method getType()
- removed attribute type from abstract base class Element

added first version to find and store neighbours of all elements during mesh initialisation (work in progress)

- added method to calculate a balanced workload

[new file SimpleTests/MatrixTests/MatVecMultPthreads.cpp]
- test matrix vector multiplication employing pthreads and balanced work

[files MathLib/LinAlg/Sparse/amuxCRS.{cpp,h}]
- implemented matrix vector multiplication employing pthreads that better balances the work

- fixed a typo
- print host info under Unix
- fixed some memory leaks

[file SimpleTests/MatrixTests/MatVecMultNDPermOpenMP.cpp]
- added TCLAP and logog to file
- added Copyright and License notice

- added copyright notice
- output machine name running the program

[file SimpleTestsMatrixTests/MatVecMultNDPerm.cpp]
- added copyright notice

- analyse work per core employing OpenMP