Tracking through the 'setRefinement(..)' function,
Removing unneeded code, occasional formatting edits to make
long lines easier to read etc.
Trying to find the problems with pairing faces later, but
reading through and testing parts to ensure code is not
running down many 'if' branches for no reason, and so on.
Merge branch 'changing-process' of https://github.com/chrisb2244/2D-AMR-OFlib into changing-process