[doxygen]

The parameters are now listed using the mark down support of doxygen for
creating tables. The parameter spreadsheet and html are now superfluous.
The script for checking new/old parameters has been updated.

reviewed by bernd


git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@15394 2fb0f335-1f38-0410-981e-8018bf24f1b0