doxgen: use $BASEDIR/dumux instead of the deleted $BASEDIR/dune/dumux as base directory

git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@4320 2fb0f335-1f38-0410-981e-8018bf24f1b0

doc/doxygen/Doxylocal

 # This file contains local changes to the doxygen configuration
 # please us '+=' to add file/directories to the lists
 
-INPUT                 += @top_srcdir@/dune/dumux
+INPUT                 += @top_srcdir@/dumux
 EXTRA_PACKAGES        += amsmath,amssymb