Listing the names through EntryCompletion

I have added the name listing with asymmetric crypto

I had to remove status listing and STDERR listing on the right for key listing, since if I didn't do that, the program hanged indefinitely and it never showed the STDERR again correctly; it has probably something to do with threads/processes. Well, anyway, now it works, even when it's a bit hacked.

It uses GtkEntryCompletion - that means you have to write at least one character in order to see the possibilities (but you can then delete it and see all of them; it's a bit weird); and it is searched only from the start (so no smart matching etc).

It should not break anything