Easyblocks for R extenison patching (including extract) and Extesnion Rm...

...pi Intel MPI support (if version >= 0.6-4)
this needs a comment... why only since v0.6-4, is it simply not supported in earlier versions?
also mention that `MPI_TYPE` doesn't distinguish between MPICH and Intel MPI, which is why we also check `mpi_family()`