Add hyperlinks.

doc/installation.rst

@@ -10,8 +10,8 @@ There is no need for most users to install the web framework. It is already
 installed for you by our sysadmins on the 'modbase' server machine.
 
 Sysadmins: if you do need to make modifications to the framework itself,
-this can be done by cloning the git repository at
-https://github.com/salilab/saliweb to a directory on modbase, making your
+this can be done by cloning the `git repository <https://github.com/salilab/saliweb>`_
+to a directory on modbase, making your
 changes, writing test cases to exercise those changes, running 'scons test'
 to make sure the changes didn't break anything, 'git commit' and 'git push'
 to commit the changes, then running 'sudo scons install' to update the
@@ -30,6 +30,8 @@ Prerequisites
 
 * SGE
 
+* `MODELLER <http://salilab.org/modeller/>`_
+
 * DRMAA Python bindings
 
 * Web server (e.g. Apache)