ENH: extend rmDir to handle removal of empty directories only
- recursively remove directories that only contain other directories
but no other contents. Treats dead links as non-content.
- similar functionality as newMesh etc.
Relocated to finiteVolume since there are no dynamicMesh dependencies.
- use simpler procAddressing (with updated mapDistributeBase).
separated from redistributePar
- supports redistributePar -decompose -fileHandler collated
- supports redistributePar -reconstruct
- does not support redistributePar with collated in redistribution mode