Original commit message from CVS:
* gst/gstpad.h:
* gst/gstquery.c: (gst_query_set_position),
(gst_query_parse_position), (gst_query_set_duration),
(gst_query_parse_duration), (gst_query_new_convert):
* gst/gstquery.h:
* gst/gstutils.c: (gst_element_query_convert):
* gst/gstutils.h:
Docs and consistency fixes.