Description of problem:
The current situation is that the lam implementation of MPI is shipped as part
of Core, and OpenMPI is in Extras. However, the lam homepage states:

"LAM/MPI is now in a maintenance mode. Bug fixes and critical patches are still
being applied, but little real "new" work is happening in LAM/MPI. This is a
direct result of the LAM/MPI Team spending the vast majority of their time
working on our next-generation MPI implementation -- Open MPI"

Since Fedora policiy is to move with upstream, lam should be replaced with
OpenMPI in core.

Why do I care? Well, as one example, currently it is not possible to build and
ship the Valgrind OpenMPI wrappers, since this would need a
BuildRequires:openmpi in the Valgrind package, and Core packages cannot BR
Extras packages AFAIK.

(For info on the Valgrind MPI wrappers see:
http://www.valgrind.org/docs/manual/manual-core.html#manual-core.mpiwrap)

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