docs/: add new API entries to the docs

docs/: add new API entries to the docs

Original commit message from CVS:
* docs/gst/gstreamer-docs.sgml:
* docs/gst/gstreamer-sections.txt:
* docs/libs/gstreamer-libs-sections.txt:
add new API entries to the docs
* libs/gst/controller/Makefile.am:
* libs/gst/controller/gstcontroller.c:
* libs/gst/controller/gstcontroller.h:
* libs/gst/controller/gstcontrollerprivate.h:
* libs/gst/controller/gsthelper.c:
* libs/gst/controller/gstinterpolation.c:
move private structs to private header
* po/README:
gstreamer-0.7 -> gstreamer-0.10
* tests/check/libs/struct_i386.h:
remove private structs