Todo list, and bugs
===================

BUGS:
O signed plain: a line beginning with "--" is transformed to "- --"
  This is not a bug; this is done by gpg. There is an option ib gpg to avoid this, but it should not be neabled for emails!
X signed MIME: no signature block!
X if preferences have never been set, an exception (setting nil object for key) is raised when preferences are saved


Modifications:
X When looking for PGP marks, check for preceding/following endOfLine => avoid problem when finding one in reply.

New Features:
- Add buttons on Mailbox Viewer to decrypt/authenticate selected message
- Read/write the following headers:
  X-PGP-KeyID: 621CC013
  X-Request-PGP: http://www.openit.de/people/wk/gpg.html
X Add timeout for passphrase cache
