included the docextra/parameterlist and docextra/parameters.html in...

included the docextra/parameterlist and docextra/parameters.html in Makefile.am in order to be able build doxygen with tarball 

git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@11674 2fb0f335-1f38-0410-981e-8018bf24f1b0

doc/doxygen/Makefile.am

@@ -4,7 +4,7 @@ CURDIR=doc/doxygen
 
 # add some more stuff to install and tarball
 DOCFILES = $(PAGES)
-EXTRA_DIST = $(PAGES) mainpage modules images/*.png
+EXTRA_DIST = $(PAGES) mainpage modules images/*.png extradoc/parameterlist extradoc/parameters.html
 
 include $(top_srcdir)/am/doxygen
 include $(top_srcdir)/am/global-rules