philtophoblaw.hh : updated documentation and added two example graphs in the documentation (pc_Sw_1 & pc_Sw_2). Also added the graphs (as *.png and *.svg) which are displaying the pc-Sw-relationship for the case in which water is the non-wetting phase.



git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@11249 2fb0f335-1f38-0410-981e-8018bf24f1b0