This commit is to implement follwoing changes:
- closes#91;
- Mention that GPG key may be expired or revoked:
in the account dialog if the number of OpenPGP keys found is 0,
the label also notes that a key may have been revoked or expired;
- blocks input in chat box if key is use is revoked or expired;
(cherry picked from commit 2f3ddad1e87f99cdda9d42dbabc528c2b29c0476)
Signed-off-by: Vadim Lomovtsev <jelezny@gmail.com>
8f4d78910c