Added MassFluxFunction for cleaner determination of mass flux on the whole mesh (plus visualization of where mass is being created and/or destroyed).
Added all sorts of quantities of interest to NavierStokesCavityFlowDriver.
Much work on NavierStokesHemkerDriver, including fancier CLI parameters.
Added support for placing the cylinder somewhere other than the vertical midpoint for Hemker geometry.
New hemker geometry method, MeshFactory.h
Added support for forcing side cache creation in Function::integrate (useful when a Function is not itself boundary-valued but depends on boundary values--MassFluxFunction is the only example so far).
Added some debugging code, now commented out, to LinearTerm.