Slab fails to compile without MPI

Issue #2683 resolved
Roland Haas created an issue

Slab only optionally depends on MPI and the Kranc tutorial does use it without MPI (or Carpet for that matter). In 9ea25cd9 this ability was lost due to MPI_Alltoallv being limited to int variables for offsets and sizes thus not usable with the 64 bit code anymore.

Pull request
restores functionality to run without MPI and makes the Kranc tutorial work once more.

It is not really nice since it fudges the function prototype of the MPI_Alltoallv dummy function used in Slab.

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