The last thing before release: the relation code had first been written when there were no virtual classes. Adding the latter made the relation code buggy. We are rewritting the relations finders to simplify the zafu syntax and resolve all the bugs introduced by virtual classes.

New syntax:

<r:posts in='site' or='added_notes'/>
or with the 'do' syntax:
<div do='projects in site' or='added_notes'/>