CarpetLib: Make many MPI experiments configurable

Add new parameters:

BOOLEAN interleave_communications:
Try to interleave communications with each other; each processor
begins to communicate with its 'right neighbour' in rank, instead of
with the root processor

BOOLEAN vary_tags:
Use different tags for each communication

BOOLEAN barrier_between_stages:
Add a barrier between the communication stages (slows down, but may
make timing numbers easier to interpret)

BOOLEAN combine_sends:
Send data together and in order of processor ranks

BOOLEAN reduce_mpi_waitall:
Call MPI_Waitall only for requests that are not null

BOOLEAN use_mpi_send:
Use MPI_Send instead of MPI_Isend

BOOLEAN use_mpi_ssend:
Use MPI_Ssend instead of MPI_Isend

darcs-hash:20061206165333-dae7b-8ba40bd19fb1733336e60cb7e6bfa0ebfe0d546d.gz

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