- added a pc-version with different signature:

pC(const Params &params,  Scalar Sw, const Scalar temperature)
i.e.: temperature dependent capillary pressure. 
- Not final but subject of discussion


git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@6633 2fb0f335-1f38-0410-981e-8018bf24f1b0