- Add Template abstraction to MPIIsend and MPIIRecv
- Distributed Grid Synchronizer is now indipendend on DOF datatype (bound to basic C types, types known by MPI)
- Distributed Grid Synchronizer now uses WaitAll function.

The original algorithm used space as one of the separators between types
in template parameter lists, so as a result "A< short int >" was parsed
into a list of ("A", "short", "int").

Adding explicit template instantiation.
Moving some _impl.h files into implementation dir.

Adding unit tests for tnlString, tnlObject and tnlArrayManager.

Adding links on matrices statistics in HTML and patterns in PDF to SpMV benchmark logs.

There is gap of missing commits.