-Reformatted output of pressure module
-overhauled upwinding: Fully Upwind and central implemented, fix for the case potential = 0.
-Prepared stable modules for merge of multiphyiscs and adaptive model:
-Total Concentration (P.V.) is now in cellData and not in FluidState
-MuPhys: FluidState that is present locally conceptually decoupled from subdomain.

Reviewed by Bernd

git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@8383 2fb0f335-1f38-0410-981e-8018bf24f1b0