Slab fails to compile without MPI

Slab only optionally depends on MPI and the Kranc tutorial http://kranccode.org/tutorial.html 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
https://bitbucket.org/cactuscode/cactusnumerical/pull-requests/19/slab-support-running-without-mpi
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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