Added sane_environment to compensate for Apache's grand solution of renaming all environment vars when rewrite rules are used in .htaccess files. Also moved
the HTTP_CGI_AUTHORIZATION sniffing hack there while I was at it.

numbers in all other projects/libraries.

This makes it easier for a package to replace an different package with itself
while it is being imported.

there is a CONTENT_LENGTH header, regardless of the request method.

the access control check that requires aq_inContextOf. Also fixed the
content-type being set as precondition problem for Files and Images, and
made *all* text PUTs create Documents, not just text/html PUTs.

in tree tags.