Remove unused CfdMeshMgr::CreateSource method
Make CfdMeshMgr::DeleteAllSources also clean up simple sources held by Geoms.
Cleanups and tweaks in GridDensity.
Make so sources blend to base_len, not to order-dependent local length.
Strip sources down to nothing but ParmContainers
Clean up SimpleSources, remove remnants from Source and simplify
Don't double copy line source length and radius.