`b' in ivy should go to BBdB entry

[unhammer]

We should have a gnus-recent-show-in-bbdb which shows the sender's BBdB entry (maybe also gnus-recent-show-all-in-bbdb which does the same for sender+all recipients).

[deusmax]

my branch featuretrack has BBDB implemented for helm in function gnus-recent-bbdb-display-all. The format of the ```gnus-recent--articles-list`` has changed into an alist. I think it works pretty well.

Other changes:

• M-<up> to toggle the recipients display (To, Cc fields).
• C-j or C-<up> (careful to similar to above) to "forget" the entry at point (without quiting helm)
• <Fn>-5 action to add the sender/recipients to BBDB and display a BBDB buffer.
• Added save & read functions for persistence of gnus-recent--articles-list data.

Let me know what you think.

[unhammer]

Could you create a PR rebased onto my master branch?

[deusmax]

sure!
also just added tracking of outgoing messages (but haven't tested it at all, so it may have issues)