added WallModelProbe, replaced PostProcessingVariable with Statistic in Probe (and all derived classes) and added some documentation

Added SG model to StressBC, added Timer-class which wraps existing timer in Simulation, added round-off correction in TurbulentViscosityCumulantK17CompChim_Device (testing ongoing)

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.

adds wrapper for gpu WIP

and refactore this function for better readability

and refactoring this function for better readability

Remove them from LevelGridBuilder

fixes pipeline #7586

For communication after interpolation fine to coarse

(cherry picked from commit b3cf5c2eb5dad849b6c8d71552ca995fbe7a487e)

cherry-pick 56b49f3

Find all send and recv indices which also are interface cells fine to coarse, coarse (iCellFCC).
Move them to the front of the vector of send and recv indices. Return their number as well.