This patch make several WSGI related alterations. First, it changes the server to be almost a generic WSGI server. Second, it changes request.py to have wsgiapplication and _wsgirequest. wsgiapplication is a class that creates _wsgirequests when called by a WSGI compliant server. It needs to know whether or not it should create hgwebdir or hgweb requests. Lastly, wsgicgi.py is added, and the CGI scripts are altered to use it to launch wsgiapplications in a WSGI compliant way. As a side effect, all the keepalive code has been removed from request.py. This code needs to be moved so that it is exclusively in server.py

Fix server to set up a more WSGI compliant environment.

import: parse email messages

Don't require opts['dry_run'] to be set to fix external tools like tailor.

Allow using default values with ui.configlist, too, and add a test for this.

Make "[web] allow_push, deny_push" and "[http_proxy] no" use ui.configlist.

Fixed [web] allow_archive for comma separated parameters by using ui.configlist. Changed tests/test-archive to use allow_archive instead of the deprecated allowzip, allowgz and allowbz2.

Added ui.configlist method to get comma/space separated lists of strings. For example: users = alice, bob colors = red green blue

Fix ui.expandpath problem and broken test introduced by 4a2a4d988ead.

do not try to package lsprof if not available.