Fixed periodicity issue by addind STOPPER_OUT_OF_GRID_PERIODIC flag. Further preparaions for stress BC

Added configBoundaryLayer.txt. Added Slip BC allocations to GridGenerator. Can now be used again, but thus far ignores normals and uses the default q's set by the SideType. Modified NoSlip BC, now just adds a velocity BC with zero velocity.

Merge branch 'python_bindings' of https://git.rz.tu-bs.de/irmb/uppsala/VirtualFluids_dev into experimental

Merge branch 'actuator_line' of https://git.rz.tu-bs.de/irmb/uppsala/VirtualFluids_dev into experimental

also some bug fixes

Merge branch 'develop' of https://git.rz.tu-bs.de/irmb/uppsala/VirtualFluids_dev into python_bindings

adds wrapper for gpu WIP

Added cuda and mpi library (Closes #20)

Closes #20

See merge request irmb/VirtualFluids_dev!70