Add the encapsulation sections as appendicies. I can't figure out how to

Add the encapsulation sections as appendicies. I can't figure out how to
include parser-protected text into a docbook xml file, so the rtp version
will have to wait for makefile support to generate a wrapper.

Our colophon has become a third appendix, since articles aren't permitted
to have explicit colophons.

svn path=/trunk/vorbis/; revision=4016