Proxy support in KDE4 [patch attached]

[Maksim Orlovich]

> Here is my patch. It's somewhat "quick and dirty" too, so I don't think it
> will go to mainstream, but I think it's a good starting point.
> Manual proxy configuration works, https handling works, autoconfiguration
> works too (PAC at least)...

The script changes are clearly correct (how the heck did I not fix that?),
as is the D-Bus signature, so I'll go ahead and commit those. They won't
do much good w/o the kio_http change, but at least they wouldn't be broken
in SVN..

Thanks!