ext/ogg/gstoggdemux.c: Generate correct disconts for live chained oggs.

ext/ogg/gstoggdemux.c: Generate correct disconts for live chained oggs.

Original commit message from CVS:
* ext/ogg/gstoggdemux.c: (gst_ogg_pad_event),
(gst_ogg_pad_internal_chain), (gst_ogg_pad_typefind),
(gst_ogg_demux_chain_elem_pad), (gst_ogg_demux_queue_data),
(gst_ogg_demux_chain_peer), (gst_ogg_pad_submit_packet),
(gst_ogg_pad_submit_page), (gst_ogg_chain_new),
(gst_ogg_demux_init), (gst_ogg_demux_activate_chain),
(gst_ogg_demux_perform_seek), (gst_ogg_demux_collect_chain_info),
(gst_ogg_demux_collect_info), (gst_ogg_demux_chain),
(gst_ogg_demux_send_event), (gst_ogg_demux_loop):
Generate correct disconts for live chained oggs.

* gst-libs/gst/audio/gstbaseaudiosink.c:
(gst_base_audio_sink_render),
(gst_base_audio_sink_create_ringbuffer),
(gst_base_audio_sink_change_state):
Handle discont math correctly.

* gst/playback/gstplaybin.c: (add_sink):
Some small debug cleanup.