Tiny tweaks in initialization output:

- uses output routine of derived pressure modules through asImp_()
- Total concentrations are calculated in every initialization step to avoid "nan" in output


git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@10145 2fb0f335-1f38-0410-981e-8018bf24f1b0