Removed all {refine,update}AtZero functions, since these were intended
only for testing and cause more problems than they seem able to solve.
As such, a modified copy of dynamicFvMesh.H is no longer needed
Updated with some logic from 2.3.x.
Did not include the moving points sections although may do so later.
2.3.x moves to a maxCellField instead of a minCellField. This will
probably be changed here also once I work out why it was changed, and
how it alters code execution.