Redmine

Here is a patch to allow the following feature :
- assign Issues to a project version (already ok in redmine)
- enter a date for that version (already ok in redmine)
- copy that date as the due_date of all the issues that should be fixed for this version
- copy that date recursively to the issues that blocks the above issues.

One can discuss about this feature. But their is a need for us at EADS Test&Services.
Be careful about the recursivity (loop).