Otherwise other directories may be considered as part of erp5.util
(such as product).

Single quotes need escaping, double don't.

- Handle splitted SM, including those at root.
- Allow caller to drop root SM (via 'get_matching_key').
- Fix detection of draft trees that are out of sync
  (cf commit 200bf7cb)

cf commit addfd436
("removed useless commits in flush")

Add ProductionOrderLine property sheet to Production Order Line portal type. It had to be added, but it did not.