Original commit message from CVS:
* docs/design/part-buffering.txt:
* docs/gst/gstreamer-sections.txt:
* gst/gstmessage.c: (gst_message_new_buffering),
(gst_message_parse_buffering):
* gst/gstmessage.h:
Added methods to create and parse BUFFERING messages.
Added preliminary docs about buffering.
API: gst_message_new_buffering
API: gst_message_parse_buffering