Anubis / Xlib

- 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