Easier to axe this file than give such a short list compared with the huge number of people who've since contributed.

I haven't changed Makefile to use this sphinx-build in case is screws with whatever is used on docs.zope.org.

Backport removal of experimental support for configuring the Twisted HTTP server as an alternative to ``ZServer``.

o Added "sane" registration of it during initialization of Five, instead
  of registering it via import side effects.

Clearing frees resources, closing also sends out the end-request event. Clones
of the current request need to be cleared, only the actual current request
needs to be closed. Fixes LP #414757.