Fix/petsc finalize
This MR fixes the issue on latest OpenMPI (as found on Fedora 21) which produces errors when using MPI that MPI_Attr_get() function is called after MPI_Finalize(). This is because we were previously not calling PetscFinalize(). The PetscInitialize and PetscFinalize calls have been moved to CommMpi to ensure they are called at the right time and in the right order.
Dave should probably review this, since he implemented the PETSc stuff.
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Added 1 new commit:
- 5ea4237a - Added PetscInitialize back in GlobalLinSysPETSc for OSX
@ssherw: This branch now passes across all buildbots.
@dmoxey Hi Dave can you review this fix branch. I have had a look over and it seems good but you should also check.
mentioned in commit fa4ca62a
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