#1001: Distinguish between local and global reduction handles

Comment (by Roland Haas):

Applied as git hash 458bded "NaNChecker: user correct reduction handle with ReduceLocalScalar" of cactusutils

Applied as git hash 664a7f8d "Hydro_Analysis: use correct reduction handle with ReduceLocArrayToArray1D" of einsteinanalysis

Applied as git hash 6482a628 "CarpetReduce: distinguish between array and gf reduction ops in test" of carpet

Applied as git hash 32def5eb "Cactus: use different handle ranges for old-style array and grid reductions" of cactus