added new bounadary epsilon for datagenerator. parallelized parts of mn solver (openMP). Removed compiler warnings. Removed bug in datagenerator.

added FileNotFound Error message. Added option to specify data directory. Added checks if datafiles exists in ICRU reader class

 changed moments in newton optimizer to const( safety reasons )
    .parallelized newton multicell optimizer.removed<iostream> from several files.Added datagenerator mode to GaussLegendreQuadrature. Parallelized
    datagenerator. Datagen works now. added safer destructor for datagen. computed initial condition for linesources with monomials

encapsulated momentBasisIndexing in SphericalBasisClass. Added error catches for PN solver with wrong basis choice. Adapted MN Solver to monomial basis (constructor, output, solver. Scatterkernel works only for isotropic (not tested)). Adapted setup of initial conditions to changed basis. More encapsulating in solverbase. Shifting PrepareVolumeoutput from constructor to solverPreprocessing.

config constructor now deletes options proberly. shperical harmonics is now in toolboxes. icru is now in problems.

abstracted solver routine to base class, created option for screen output, introduced solver postprocessing. Done for SN Pn and MN

Extended ExportVTK to multigroup writing. Restructured Solveroutput for PN and MN Solvers to Multigroup with cleaner code. Removed dFlux as Screenoutput. Adapted other solvers to maintain compatibility with the new ExportVTK format. _solverOutput is now legacy and will be removed in future commits!

newton optimizer works. unit tests for it work. Quadrature Gauss legendre must be on full sphere. Header clean up