wsgiserver optimization: no need for mimetools' subclass of rfc822.Message. Also inlined header transform into a single pass.
wsgiserver optimization: no need for mimetools' subclass of rfc822.Message. Also inlined header transform into a single pass.

--HG--
extra : convert_revision : svn%3Ae1d34091-3ce9-0310-8e96-997e60db3bd5/trunk%401554

cherrypy/magicbus