ogg muxing of vorbis and theora now has pages ordered correctly again, even with...

ogg muxing of vorbis and theora now has pages ordered correctly again, even with delays.

Original commit message from CVS:
ogg muxing of vorbis and theora now has pages ordered correctly again,
even with delays.

* ext/ogg/README:
updated with some examples
* ext/theora/theoraenc.c: (granulepos_to_timestamp),
(granulepos_add), (theora_buffer_from_packet):
* ext/vorbis/vorbisenc.c: (granulepos_to_timestamp_offset),
(granulepos_to_timestamp), (gst_vorbisenc_buffer_from_packet),
(gst_vorbisenc_chain):
implement strategy from ext/ogg/README
* ext/ogg/gstoggmux.c: (gst_ogg_mux_buffer_from_page),
(gst_ogg_mux_push_buffer), (gst_ogg_mux_dequeue_page),
(gst_ogg_mux_pad_queue_page), (gst_ogg_mux_compare_pads),
(gst_ogg_mux_queue_pads), (gst_ogg_mux_collected):
Fix muxer so that oggz-validate is happy with all streams;
except for no eos mark, and the BOS page ordering
* tests/check/pipelines/theoraenc.c: (check_buffer_is_header),
(check_buffer_granulepos):
* tests/check/pipelines/vorbisenc.c: (check_buffer_granulepos):
update tests to check for OFFSET being set as requested
fixed type of granulepos, it's not a ClockTime