* (bug 14977) When detecting $wgServer, treat IPv6 addresses in $_SERVER['SERVER_NAME'] etc. in a sensible way.
* Tests for the new functions in IP.php and Installer.php
* Made preg_replace calls easier to verify w.r.t. captures
* (bug 25920) Made RE_IPV6_ADD avoid conditions on whether a named group matched anything, which requires PCRE 6.7+ (not bundled with PHP 5.1.0)
* MW requires PHP 5.1+, so the -1/false ip2long annoyance is gone. Also, ip2long("255.255.255.255") is -1 so no special case code is needed anymore.
* Removed toSigned() (not used outside IP.php). Due to the above points, ip2long() is totally equilivant.
* Moved some functions and consts around.
* Comment tweaks.
** Fixed hexToOctet()/toOctet() padding (pad left not right)
** Made hexToQuad() left-pad input (e.g. C -> 0000000C)
** Added isPublic6() function (checked as needed by isPublic())
** Rewrote isValidBlock() to not do flaky and roundabout isArray() check. Works for v6 now.
** Removed toArray(), unused outside IP.php and broken for v6
** Removed toOctet() duplication
** Added new private IPv6ToRawHex() function. Used to make toHex() faster.
** Made some functions private
** Reverted r20435, pointless
** Updated credits
* Changes in IPTests:
** Added a bunch of tests (mostly v6)
** Removed weird array test (especially with toArray() gone) after r76514
** Padding *no* longer needed for hexToX functions - assertion flipped
* CheckUser: removed parseRange6() reference (now private)
** Made RE_IPV6_ADD and sanitizeIP() hande '::'.
** RE_IPV6_ADD is no longer over-inclusive (# of octets and '::' must be valid)
* Removed weird debugging code
* Broke long line
* Add IP::formatHex(), the inverse of IP::toHex(). So that you don't have to guess if it's IPv4 or IPv6.
* Rewrite IP::hexToQuad() so it actually works.
This file is really a mess, though. We need a unified system of
functions that will autodetect any IP address format and convert to any
desired format, not this hodgepodge of inconsistently-named and
inconsistently-operating hacks.
IP::sanitizeIP() for some reason is used to return IP-or-something-that's-not-an-IP, but was incorrectly checking for empties. Thus for '0' input it returned NULL instead of '0'.
