detect Intel MPI in __init__ and print versionString when error occurs

[AStupidBear]

[andreasnoack]

It looks like the code changes here don't match the PR title

[AStupidBear]

Is there any problem with this PR?

[bernstei]

I think you should probably add fixes to support Intel MPI in MPIType and MPIOp as well. Looks to me (from looking at, e.g. oneapi/mpi/2021.1.1/include/mpi.h) that Intel MPI uses the same numerical constant definitions as MPICH exactly, so you could just add :IntelMPI to the if clauses that currently match for MPICH3.

[Sideboard]

Intel MPI should be compatible with MPICH since they are part of the MPICH ABI Compatibility Initiative.