Fixes to make the code runnable
Fixes to make the code runnable

- disable SPMD and auto-parallelization for now
- avoid copies by converting centered reductions to reads+writes
- tell Regent to inline helper tasks, to reduce analysis load

manopapad/liszt-legion,manopapad/liszt-legion,manopapad/liszt-legion,manopapad/liszt-legion,manopapad/liszt-legion