changed x1Idx for second component to xIdx to avoid confusion
added molar concentration gradient to 1p2cfluxvariables.hh
usage of comp2Idx instead of 1 bei 2-point gradients,
calculate concentrationgradient mit concentrations in
1p2cfluxvariables.hh
splitted computeflux in advective and diffusice component
1p2c/1p2clocalresidual.hh
temperature from problem-file in 1p2cvolumevariables.hh



git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@5304 2fb0f335-1f38-0410-981e-8018bf24f1b0