KIO proxy overhaul Part I:

Features:
- Switched the PAC file parser from KJS to QtScript.
- Implemented the Microsoft IPv6 PAC extensions.
- Implemented support for returning SOCKS proxy information (only SOCKS5).
- Added a new dbus call, proxiesForUrl, that returns all the proxy addresses
  for a given url.
- Added a new kpactest file to test the new MS IPv6 extension functions.

Fixes:
- Fixed the DateRange function by adding back two missing months in the static
  months array.
- Fixed the DNS related functions by fixing how the lookup works through
  the following modification to the KIO DNS caching code:
    * Added a function, lookupCachedHostInfoFor, for quering the KIO cache for
      information without causing a DNS query.
    * Added a function, cacheLookup, for inserting a DNS lookup result into
      the KIO cache.
- Fixed myIpAddress by using QNetworkInterface, though this fix is still far
  from ideal since it grabs the first suitable interface on multi-homed systems.

REVIEW: 100971
BUG: 153973
BUG: 267844
FIXED-IN: 4.7
DIGEST: KIO Proxy overhaul for KDE 4.7