feature request: SOCKS proxy support

hi,

it seems like some guy requested this feature 5 weeks ago in a language neither you nor i understand.
this would actually be quite useful, in case you have ssh access to some machines, since the common ssh implementations (openssh, putty, ...) have a built-in socks proxy.
a simple script is enough to create the proxies, which enables parallel downloads.

example:
$ ssh -D 1080 -N -T remote_host.domain
creates a proxy server, reachable as localhost:1080.

one additional note:
in options/preferences/connections/additional proxy servers:
currently it is unclear that only http proxies are supported.

thanks.

I already tried to add support for SOCKs proxy, but it's difficult.
>> currently it is unclear that only http proxies are supported.
ok, I will add some info into readme.txt

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