Feature overlapping zones

Summary

More functionality to allow overlapping zones (cell,face,pointZones). (note this was already supported in polyMesh and decomposePar)

Resolved bugs (If applicable)

none

Details of new models (If applicable)

It is not used by default - it requires explicit code changes to insert overlapping cellZones. So far adaptations have been made:

• mesh.cellZones() / faceZones() etc : investigate which zones items are in
• redistributePar
• subsetMesh
• polyTopoChange

Risks

Should be backwards compatible.