2p2c version in new decoupled framework:

- new data structure applied
- fluidstate can now be used in cell-Data structure: added set-functions, reworked flash
- redesign of pressure formulation: assemble split in smaller functions, PV now moved from variableclass
- redesign of transport
- various cleanups


git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@7346 2fb0f335-1f38-0410-981e-8018bf24f1b0