Switch to side-by-side view

--- a/setup-common.bash
+++ b/setup-common.bash
@@ -36,6 +36,13 @@
 #
 # This already happened just to get this file to run;
 # now assume we run it in-place.
+
+echo '# installing turbogears dev head'
+pushd ..
+hg clone http://bitbucket.org/turbogears/tg-dev/ tg-dev
+cd tg-dev
+python setup.py develop
+popd
 
 echo '# installing pymongo and dependencies'
 pushd ..