PythonAPI now hanbdles pure virtual method automatically, so should be save to use pure virtual in our CPP interfaces

Remove transformation from FormFactorCrystal; transform Lattice and LatticeBasis instead of q for form factor calculations; rotate mesoformfactor also

Make FormFactorDecoratorMaterial owner of (transformed)material; updated python API; removed transformation from FormFactorCrystal::evaluatePol; clone IMaterials

MesoCrystal test is off, new fitting examples for spheres in a lattice and corresponding changes in visitors

Implemented automatic propagation of BornAgain version number via cmake. Version must be defined only in the file cmake/modules/BornAgainMacros.cmake.

Fixed some problems with ambient material not being initialized in diffuse form factors; added the final part of diffuse calculation for polarized mesocrystals

Completed creation of mess form factor that supports polarized calculations; refactor: remove spaces before public, protected, private

Moved some implementations out of header file; fixed ParticleCoreShell for matrix form factor creation