Introduce a new parameter "use_alltoallv" that decides whether to use

MPI_Alltoallv or to use MPI_Irecv, MPI_Isend, and MPI_Wait to
communicate.  The latter is not tested, but may be faster if only a
few of all processors are involved in the communication.

Disable some self tests: Allow processors who do not participate in
the communication (who specify a zero slab size) to not know the
geometry of the source and destination slabs.


git-svn-id: http://svn.cactuscode.org/arrangements/CactusNumerical/Slab/trunk@50 2e825fa2-fb71-486d-8b7f-a5ff3f0f6cb8

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