Vhirl 24 - Enable parallel processing for TCRM

Includes a puppet module that provisions MPI and pypar on centos65 based on the anuga one. A new image has been provisioned on nectar, and support added to the TCRM code in VHIRL.

AC: Run a TCRM job on a larger image and make sure it runs multiple processes (it completed in 1h50m in the monash zone on a 4 CPU image).