added index for total phase

   - additional to wPhaseIdx and nPhaseIdx there is an index
     totalPhaseIdx



git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@6558 2fb0f335-1f38-0410-981e-8018bf24f1b0

dumux/decoupled/2p/2pindices.hh

@@ -50,6 +50,7 @@ struct DecoupledTwoPCommonIndices
     // Phase indices
     static const int wPhaseIdx = 0; //!< Index of the wetting phase in a phase vector
     static const int nPhaseIdx = 1; //!< Index of the non-wetting phase in a phase vector
+    static const int totalPhaseIdx = 2; //!< Index of the total phase (wetting + nonwetting)
 
     //saturation flags
     static const int saturationW = 0;