Allow to define reverse Multilinks Now it's possible to specify a rev_multilink parameter when creating Link or Multilink properties. The parameter takes a property name to be inserted into the linked-to class. It allows to navigate from the other side of the link as if it where a forward Multilink using the existing data structures.

--- a/roundup/roundupdb.py	Sun Apr 12 21:03:55 2020 +0100
+++ b/roundup/roundupdb.py	Wed Apr 29 16:30:27 2020 +0200
@@ -46,7 +46,7 @@
     gpg = None
 
 
-class Database:
+class Database(object):
 
     # remember the journal uid for the current journaltag so that:
     # a. we don't have to look it up every time we need it, and