[doxygen]

Updated featurelist for all freeflow and multidomain tests and partially
for io and material.
As the parameterlist.txt, now also the featurelist.txt uses the doxygen
markdown for the tables.


git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@15397 2fb0f335-1f38-0410-981e-8018bf24f1b0