[PATCH] GPG key-fetching

[Kevin B. <kb...@gm...>]

Hi folks,

the attached patch replaces the dummy function (mc-gpg-fetch-key) by a
real one. This makes it possible for Gnupg users to fetch keys from
external servers.

Please have a look, test this and send me comments before I start
integrating the function into the menu and the other framework.

The error handling is a bit, uh, binary. Do you think it needs to be
more verbose (e.a. report the reason for failures)? I left this because
if one has really trouble there exists the possibility to have a look at
the gpg error buffer.

Kevin