CarpetLib: Introduce pseudoregion class

A pseudoregion is almost a region; it is a bbox that lives on a
certain processor.  Pseudoregions are a compact way to store
information about what processors needs to send data to what other
processor during synchronisation or regridding.

Introduce a class pseudoregion.  Add additional pseudoregion fields to
the dh class.  Use these fields when communicating; this is faster
than walking the original data structures.

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