Add StaticVectorFor - for cycle doing all combinations of directions

Heavy Refactorization of DistributedGrids:
	-> Reordered Directions
	-> Add some useless Direction helper functions
	-> Set Up DistributedGrid_Base - shared base with dim template parameter
	-> Add support for communicationGroup created for DistributedGrid (MPI communicator support)

Preapare Distributed Grids for Communication groups (aka MPI Communicator)

Fix DistributedGrid_Base - add missing getEntitiesCount - providing global grid entity count - used in tnl-lbm

Fix Auto distribution when no distribution is specified.

Code refactoring.

Added parallel reduction to communicators.

Added command line arguments for a grid domain decomposition setup.

Added MPI info logs.