Anubis / Xlib

…CXM_multihost_http_server.anubis".
Adding "Bool using_state_cookies" in "make_web_site_description" in "web/CXM_making_a_web_site.anubis"
Adding "make_state_cookie_headers" in "web/CXM_making_a_web_site.anubis"

TODO in "web/CXM_making_a_web_site.anubis" line 2295 :
    // TODO 'make_separate_web_args_function' must retrieve state_cookies before parsing web_args if using_state_cookies is true

- Fix URL decoding bug when %xx is upper case

- HTTP redirect codes add needed 'Location' header.

Adding http header to invalidate 'keep-alive' (mandatory by HTTP 1.1)

[+] An external link can be added as 'Refresh' Meta-Tag

Changing etag from sha1 to MD5

…string.anubis function.

- headers are now read using a buffer and no more bytes per bytes
- adding headers 'Date' and 'Last-Modified' allowing to improve efficiency of browser cache
- adding header 'Server' just for decoration.

add FTP constant definition
change net_services functions that now use MessageQueue instead of RWStream socket