can change DistArray's trange (retile + more) #466
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…iledArray/meta.h deprecated in favor of TiledArray/util/invoke.h
…ge can stay same or change, up or down)
…ent-level reranging (retiling, etc.)
…t complex "constructors" in ArrayImpl
…ling by default (thanks, @calewis )
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… + test negative lobound if using signed 1-index type
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Block expressions are the efficient way to use rectilinear subset of DistArray's tiles in expressions. Keeping tiling unchanged is often a severe constraint: often we want to retile the data, in combination with growing/shrinking/changing the element range.
TA::retileprovides a limited subset of such functionality (and is inefficient). This PR provides the full nearly-optimal implementation that allows to create a new DistArray with a given TiledRange and the data of an existingDistArray(new elements are initialized to a constant).