extended capability of redistributePar

Currently does not properly handle point fields (pointMesh) or area/edge fields (finiteArea)

Ref: EP1722 (@mark and @Mattijs)

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Various notes (to self):

• requires sync checks for finite-area patches (option)
• creation of finite-area geometry without triggering communication
• direct (unweighted edge mapping). Currently always uses edge weights when decomposing fields, but these are parallel-aware and need to be triggered a priori otherwise the evaluation can block. Can probably consider also having unweighted edges, similar to what finite-volume does for faces.
• may need a general or specialized faMeshSubset to handle simple mapping (subset) of fields

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