*Removed circular inheritance of adaptive property file

*Improvement of doxygen docu:
Reworked compositional pressure modules, removed doxygen errors. Included changes induces by adaptive models into docu. The equations of the multiphysics and adaptive module still in need of improvement.

git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@9175 2fb0f335-1f38-0410-981e-8018bf24f1b0