GPG Agent in gnome-keyring

[Stef Walter <stef-list memberwebs com>]

As discussed before on the seahorse mailing list, I've implemented the
gpg-agent in gnome-keyring. At the same time I've removed the agent from
seahorse-plugins. Here's where the code is:

 * gnome-keyring gpg-agent branch
 * seahorse-plugins no-gpg-agent branch

This is a good time for anyone interested to take a look at those
branches and see how they work for you. Are there any show stoppers that
would prevent merging this into 2.31?

In particular, Peter, Adam, I'd love to hear from you since you've
contributed heavily to the gpg-agent. I can't say I understand all the
various corner cases and code that has been added to support gpg 2.0.

What's missing:

 * No default settings for lock timeouts.
 * No way to set use-agent in gpg.conf
 * Status in the notify area.

I guess we should figure out how we're going to handle the above stuff.
Should there be a combined Gnome Keyring and Seahorse preferences
applet? How do we want to tackle that?

Cheers,

Stef