Build of tools can be turned-off. Grid traversers for 1D and 2D has been rewritten using subdomain overlaps.

Implemented a method Array::checkValue which returns true only if there is an element with given value in the array.

double works, not tested for other types.

I don't understand how it could work on the small grids...

Refactoring

See merge request mmg/tnl-dev!3

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)

Conflicts:
	src/TNL/Communicators/MpiCommunicator.h

Preapare Distributed Grids for Communication groups (aka MPI Communicator)

Content moved to src/Python/__init__.py.in