Original commit message from CVS:
* docs/pwg/advanced-negotiation.xml:
* docs/pwg/building-boiler.xml:
* docs/pwg/building-pads.xml:
* docs/pwg/pwg.xml:
* examples/pwg/Makefile.am:
Add a chapter on caps negotiation, simplify the original code
samples a bit w.r.t. caps negotiation, add link to the advanced
section. Add a bunch of examples showing different use cases of
different types of caps negotiation. Upstream renegotiation isn't
fully documented yet since nobody knows how that works.
