Unmark creation_flag after having renamed the object

Unmark creation_flag after object rename so we still know that the object is in the creation process in sub methods around the renaming functionnality (setId calls manage_beforeDelete, 'onDelete' event, ...).  For example if overriding the manage_beforeDelete that is called while renaming the object because setId calls it, we still needs to know if we are in the creation process...

432 tests still pass...

Please merge ;-)

Gauthier