Switch to side-by-side view

--- a/Allura/allura/controllers/repository.py
+++ b/Allura/allura/controllers/repository.py
@@ -458,6 +458,7 @@
             result.update(self._commit.context())
         return result
 
+    @require_post()
     @expose('jinja:allura:templates/repo/tarball.html')
     def tarball(self, **kw):
         path = kw.pop('path', None)