Changed dirichlet bc map data structure so that BCs get applied in
the order of the input file.
Updated other dirichlet bc maps to conform to the new data structure
in the base class.
Had to update the value here. A little disconcerting because
nothing changed that should've affected it, but it was 10^-12 relative
difference, so just going with it.
Merge pull request #69 from pbauman/dirichlet_bc_map_fix

Dirichlet bc map fix