Added ScratchDriver, intended for my own scratch work.  Right now, it constructs big mesh topologies so I can check memory footprint.
Added BOOST_ROOT argument to do-configure-xcode-debug.
Working on ../xcode-mpi-release/do-configure-xcode-mpi-release.  I don't yet have this working locally.
Big refactoring, first of all of Mesh, for cleaner separation of geometry and degree-of-freedom manipulation, and setting the stage for minimum rule meshes.  Introduction of new index types, to be used for global dof indices as well as cell indices, etc.  Several fixes for bugs that were revealed in the process.  Added a check to Solution::condensedSolve() that will throw an exception if it's called when Lagrange constraints are defined (these are not supported by condensed solve right now).  Fixed an issue in IncompressibleFormulationsTests in which it was using condensed solve when attempting to enforce local conservation through Lagrange constraints.
Merge branch 'master' of https://github.com/CamelliaDPG/Camellia