ccm conversion bugfixes
Pesky bug with ccm conversion (issue #421 (closed)) traced to off-by-one in inplace reorder/prune of face,owner,neighbour lists.
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Fixed and merged into ListOpTemplates
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Combine normal UList and UIndirectList versions of mergePoints
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Deleted previous fragile combine-boundaries options (was commented out in 1612), since it is only "nice-to-have", but the underlying problem with boundaries being multiply connected via different interfaces is not solvable in an obvious manner.
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Other misc cleanup.