issue2550601: add multilink to patches to the bug issue. The doc string above the definition already included the code.

Author: rouilj

share/roundup/templates/devel/schema.py

@@ -157,7 +157,8 @@
                  status=Link('status'),
                  resolution=Link('resolution'),
                  superseder=Link('bug'),
-                 keywords=Multilink('keyword'))
+                 keywords=Multilink('keyword'),
+                 patches=Multilink('patches'))
 
 # Task Type
 task_type = Class(db, 'task_type',