[patch] Update parallel support functions to match spec.

[Jules Bergmann]

This patch updates the parallel support functions to match the latest 
draft of the parallel spec.  The changes are primarily in naming (for 
example, changine support function names from 'get_local_dom()' to 
'local_domain()', moving 'impl_' functions to be public, and the name of 
the type for subblocks from 'subblock_type' to 'index_type').  However, 
some new functions were added to query the global processor set and 
processor sets associated with maps.

This patch also adds support for parallel benchmarks, and includes fast 
convolution and matrix copy benchmarks that can be run in parallel.

Finally, it includes a benchmark-ified version of Randy Judd's product 
variations.

				-- Jules
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