[PATCH 0 of 5] ticket #45 related fixes

[Maxim Dounin]

Hello!

Here are patch series which fixes several bugs in proxy_set_header
(as well as fastcgi/scgi/uwsgi_param) handling.

Inspired by ticket #45, see
http://trac.nginx.org/nginx/ticket/45

Tests are available here:
http://mdounin.ru/hg/nginx-tests/rev/23f81eb0a817

Maxim Dounin

p.s. Mecurial produces awfull diff for fastcgi part of "Separate
functions to merge fastcgi/scgi/uwsgi params" patch for some reason.  It's
in fact similar to scgi/uwsgi parts, i.e. no real changes.