ported gstchildproxy over from 0.8 ported gst-inspect fixes and enhancements over...

ported gstchildproxy over from 0.8 ported gst-inspect fixes and enhancements over from 0.8

Original commit message from CVS:
* docs/gst/gstreamer-docs.sgml:
* docs/gst/gstreamer-sections.txt:
* gst/Makefile.am:
* gst/gstbin.c: (gst_bin_get_type),
(gst_bin_child_proxy_get_child_by_index),
(gst_bin_child_proxy_get_children_count),
(gst_bin_child_proxy_init):
* gst/gstchildproxy.c: (gst_child_proxy_get_child_by_name),
(gst_child_proxy_get_child_by_index),
(gst_child_proxy_get_children_count), (gst_child_proxy_lookup),
(gst_child_proxy_get_property), (gst_child_proxy_get_valist),
(gst_child_proxy_get), (gst_child_proxy_set_property),
(gst_child_proxy_set_valist), (gst_child_proxy_set),
(gst_child_proxy_child_added), (gst_child_proxy_child_removed),
(gst_child_proxy_base_init), (gst_child_proxy_get_type):
* gst/gstchildproxy.h:
* gst/parse/grammar.y:
* tools/gst-inspect.c: (print_interfaces),
(print_element_properties_info), (print_element_info):
ported gstchildproxy over from 0.8
ported gst-inspect fixes and enhancements over from 0.8