split out gpg keyring related stuff
reorg
propellor spin
changelog
use --trust-model always to avoid prompt from gpg

gpg prompts when encrypting to an untrusted key, but if propellor has been
told to add a key, we implicitly trust it.
unundo
added some details to multipe gpg keys issue
avoid configuring git signing key when there's no secret key

Also, nice display for --add-key steps
should be fixed
Merge branch 'joeyconfig'