- Rename mainpage, modules and parameterlist to *.txt
  to work around new behavior in Doxygen 1.8.8 or newer.
- Fix missing closing brackets in brine_co2.hh.
- Add missing ! in plotoverline (by fetzer)
(reviewed by fetzer)


git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@14763 2fb0f335-1f38-0410-981e-8018bf24f1b0