docs/gst/gstreamer-sections.txt: More doc hacking.

docs/gst/gstreamer-sections.txt: More doc hacking.

Original commit message from CVS:
* docs/gst/gstreamer-sections.txt:  More doc hacking.
* docs/gst/tmpl/gstaggregator.sgml:
* docs/gst/tmpl/gstautoplugfactory.sgml:
* docs/gst/tmpl/gstbin.sgml:
* docs/gst/tmpl/gstbuffer.sgml:
* docs/gst/tmpl/gstbufferstore.sgml:
* docs/gst/tmpl/gstfakesink.sgml:
* docs/gst/tmpl/gstfakesrc.sgml:
* docs/gst/tmpl/gstmd5sink.sgml:
* docs/gst/tmpl/gstreamer-unused.sgml:
* docs/gst/tmpl/gstsearchfuncs.sgml:
* docs/gst/tmpl/gstshaper.sgml:
* docs/gst/tmpl/gstspider.sgml:
* docs/gst/tmpl/gsttee.sgml:
* docs/gst/tmpl/gstutils.sgml:
* docs/gst/tmpl/gstvalue.sgml:
* docs/gst/tmpl/gstxml.sgml:
* gst/Makefile.am:  Remove gstthreaddummy.c.  It never worked,
and we don't support it.
* gst/gst.c: (gst_init_get_popt_table), (init_pre), (init_post),
(gst_use_threads), (gst_has_threads): same
* gst/gstthreaddummy.c: same
* gst/autoplug/gstspider.c: Make gst_spider_details static.
* gst/autoplug/gstspider.h: same
* gst/elements/gstaggregator.h: Remove bogus function from header
* gst/elements/gstfakesink.h: same
* gst/elements/gstfakesrc.h: same
* gst/elements/gstmd5sink.h: same
* gst/elements/gstshaper.h: same
* gst/elements/gsttee.h: same
* gst/gstbin.c: doc fixes
* gst/gstbin.h: Remove unused definition.
* gst/gstbuffer.c: doc fixes
* gst/gstcaps.c: (gst_caps_is_always_compatible): doc fixes
* gst/gstfilter.c: doc fixes
* gst/gsttag.c: doc fixes
* gst/gstvalue.c: doc fixes