Reverted StokesCavityFlowDriverForPaper to something close to what was actually in the paper (tweaked to make it still work now).
Added hard-coded flag (currently switched off) to use Ifpack_ILU (instead of Amesos) for the Schwarz block inversions.
Added access to Aztec convergence option.
Fixed issues w/single point and zero mean conditions when doing condensed solves.
Changed Boundary interface to require DofInterpreter and Epetra_Map arguments (potentially null) for bcsToImpose calls.  This fixes an issue in which two Solution objects sharing a Mesh but which differ in whether they use static condensation (i.e. have _dofInterpreter set to a CondensedDofInterpreter)--previously, whichever Solution object last called Boundary::setDofInterpreter() would win, and the other would fail (at least sometimes, silently).