Original commit message from CVS:
* docs/design/part-element-sink.txt:
Updated document.

* libs/gst/base/gstbasesink.c: (gst_base_sink_init),
(gst_base_sink_finalize), (gst_base_sink_preroll_queue_flush),
(gst_base_sink_configure_segment), (gst_base_sink_commit_state),
(gst_base_sink_get_sync_times), (gst_base_sink_wait_clock),
(gst_base_sink_do_sync), (gst_base_sink_render_object),
(gst_base_sink_preroll_object),
(gst_base_sink_queue_object_unlocked),
(gst_base_sink_queue_object), (gst_base_sink_event),
(gst_base_sink_chain_unlocked), (gst_base_sink_chain),
(gst_base_sink_loop), (gst_base_sink_activate_pull),
(gst_base_sink_get_position), (gst_base_sink_change_state):
* libs/gst/base/gstbasesink.h:
Totally refactored matching the design doc.
Use two segments, one to clip incomming buffers and another to
perform sync.
Handle queueing correctly, bypass the queue when playing.
Make EOS cancelable.
Handle errors correctly when operating in pull based mode.

* tests/check/elements/fakesink.c: (GST_START_TEST),
(fakesink_suite):
Added new check for sinks.