o Avoid logging dummy password on imap server. Closes: 3416
o Do not fail while processing an empty mail, just skip it. Fixes
3457.
o Notify of unread email explicitly every time the mailbox is
sync'ed.
o Fix signals to emit only string in the contents instead of bool or
int values.
o Improve unseen filter of email.
o Make default imap fetch period 5 minutes. Client can config it via
environment variable for debug. Closes: 3409
o Refactor imap fetch code for better defer handling. Closes: 3423
o Emit signals to notify UI for SMTP relay events. Closes 3464.
o Add events for notifications about imap activity. Closes: 3480
o Update to new soledad package scheme (common, client and
server). Closes 3487.
o Improve packaging: add versioneer, parse_requirements,
classifiers.