updated the parameterlist.txt
then renamed the gridadaptation for implicit to gridadaption, to be
consistent with the decoupled stuff and the docu.

reviewed by nicolas


git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@15504 2fb0f335-1f38-0410-981e-8018bf24f1b0