Add a debug_lock parameter to custom locking class, allowing to turn locks into debugging locks. Thos locks will complain (in a way similar to deadlocks) when acquired twice without being released. This makes it easier to assert execution flow when tracking down a bug.


git-svn-id: https://svn.erp5.org/repos/neo/branches/prototype3@1249 71dcc9de-d417-0410-9af5-da40c76e7ee4