Pesky bug with ccm conversion (issue #421 (closed)) traced to off-by-one in inplace reorder/prune of face,owner,neighbour lists.
Fixed and merged into ListOpTemplates
Combine normal UList and UIndirectList versions of mergePoints
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.
Other misc cleanup.