fix distarray lifetime in init_tiles and assignment #360
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besides minor cosmetic changes this
DistArray::operator=(other)
to respectdefer_deleter_to_next_fence_
just likeDistArray
dtor; it also copies theother.defer_deleter_to_next_fence_
flagDistArray::init_tiles
ensures that its tasks outlivepimpl_
by deferring its destruction to the next fence