Original commit message from CVS:
* plugins/elements/gstmultiqueue.c: (gst_multi_queue_set_property),
(update_time_level), (gst_single_queue_push_one),
(gst_multi_queue_chain), (gst_multi_queue_sink_event),
(single_queue_overrun_cb), (single_queue_underrun_cb),
(single_queue_check_full):
Fix setting max-* properties after adding queues.
Use IS_FILLED for checking visible items.
Signal overrun if multiple queues overrun.
Add extra debug output.
Patch by: Wim Taymans <wim@fluendo.com>