[Doxylocal]: added units package for improved latex support

[mainpage.txt]: added links to Modules overview page and to
parameterlist.txt

Reviewed by Thomas


git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@15187 2fb0f335-1f38-0410-981e-8018bf24f1b0

doc/doxygen/Doxylocal

@@ -17,7 +17,7 @@ EXAMPLE_PATH          += @srcdir@/extradoc
 
 IMAGE_PATH             = @srcdir@/images
 
-EXTRA_PACKAGES        += amsmath,amssymb
+EXTRA_PACKAGES        += amsmath,amssymb,units
 
 # enable client side searching
 SEARCHENGINE           = YES

doc/doxygen/mainpage.txt

@@ -9,12 +9,16 @@
 \section intro Introduction
 
 Welcome to the DuMuX documentation pages. This documentation has been
-generated using Doxygen, a free source code documentation system for
+generated using <a href="http://www.doxygen.org/index.html">Doxygen</a>, a free source code documentation system for
 documenting C/C++ code.
 
 \section mods Modules
 
-The best way to start is from the page Modules which gives
+The best way to start is from the page <a href="modules.html">Modules</a> which gives
 you access to the documentation by category.
 
+\section params Parameters
+
+An overview of all availabe parameters is given in \ref parameterlist.txt.
+
 */