- replace protocol response numbers with symbols

- save variant-list into main request notes
- free allocated memory from subrequests
- merge notes, headers_out and err_headers_out
Reviewed by:	Dean Gaudet, Randy Terbush, Marc Slemko
Submitted by:	Petr Lampa


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@77668 13f79535-47bb-0310-9956-ffa450edef68