Introduce the required deprecation mesages for the renamed interfaces in the...

Introduce the required deprecation mesages for the renamed interfaces in the volume variables. Sorry for the delay.  
reviewed by Bernd

git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@12248 2fb0f335-1f38-0410-981e-8018bf24f1b0