Develop

This removes compoundProblem4.pl.  Problems using that should move up to compoundProblem5.pl

I'm thinking of migrating even this name to   PGscaffoldingmacros.pl  since I think that describes what
the compoundProblem and sequentialProblem efforts have been trying to accomplish. I'm open to 
suggestions however.

It also adds some changes which Kelly Black has authored and which are already in develop