Original commit message from CVS:
* docs/gst/gstreamer-sections.txt:
add new API and fix the build
* gst/gstbin.c: (gst_bin_recalc_state):
* gst/gstelement.c: (gst_element_message_full),
(gst_element_get_state_func), (gst_element_set_state_func):
use new API and improve logging
* gst/gstutils.c: (gst_element_state_change_return_get_name):
* gst/gstutils.h:
API: add function to get StateChangereturn names to improve logs