- added `pm_cleanup_max_age`-config_var
- added 2 files (`pm_deleted_sender` & `pm_deleted_receiver`) in pm table
- changed `list_pms()` to catch only not deleted pm's
- changed `delete_pm()` now it need a user_id to delete a pm (like `get_pm()`)
- changed `delete_pm()` sender's can now detete pm's from outbox
- changed `count_unread_pms()` it counts now only not deleted pm's.
- added `cleanup_pms()` removes pms older than X defined by `pm_cleanup_max_age`-config_var
REJack
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