Parallelized the leader iterator for the block-cyclic dimension descriptor for Dimensional, but only in the limited case when there is exactly one index per block, i.e. the stride of the domain dimension is the same as the dimension's block size.
Parallelized the leader iterator for the block-cyclic dimension descriptor for Dimensional,
but only in the limited case when there is exactly one index per block,
i.e. the stride of the domain dimension is the same as the dimension's block size.

Can be turned off optionally with --BlockCyclicDim_allowParLeader=false.


git-svn-id: 88467cb1fb04b8a755be7e1ee1026be4190196ef@19480 3a8e244f-b0f2-452b-bcba-4c88e055c3ca

sungeunchoi/chapel,CoryMcCartan/chapel,hildeth/chapel,sungeunchoi/chapel,hildeth/chapel,chizarlicious/chapel,sungeunchoi/chapel,chizarlicious/chapel,sungeunchoi/chapel,hildeth/chapel,chizarlicious/chapel,sungeunchoi/chapel,hildeth/chapel,hildeth/chapel,sungeunchoi/chapel,CoryMcCartan/chapel,CoryMcCartan/chapel,CoryMcCartan/chapel,sungeunchoi/chapel,chizarlicious/chapel,sungeunchoi/chapel,chizarlicious/chapel,CoryMcCartan/chapel,CoryMcCartan/chapel,CoryMcCartan/chapel,hildeth/chapel,hildeth/chapel,chizarlicious/chapel,chizarlicious/chapel