Eliminated a circular reference in RefinementPattern.
Changed storage for registered solutions in Mesh to use raw pointers instead of RCPs (to avoid circular references).
Fixed circular reference in NavierStokesFormulation (by storing _soln as a copy of the owning RCP's pointer).
Added default handler to switch statement in RefinementHistory.
Draft implementation of h-refinement "side" basis reconciliation.  Not passing tests at present.