TODO
====

* Use a non-X.509-dependent way to check the SMTP relay certificate:
  fingerprint or Monkeysphere
* Fix the absolute paths and their ugly workaround
* Use the python configuration file only for the callbacks, and use the old one
  for the other configuration variables
* Re-clicking the arrow to hide the included technical details doesn't
  restore the main window's original size.
* Use a dedicated PGP keyring
