- only use actions, multiline sender/subject layout and pango markup in GNOME-Shell notifications
- use single line sender/subject layout in notifications on other desktops
implemented mark-as-read feature
refactored reminder class
don't write mailnag.dat on every mail check (only if its contend has changed)
minor other fixes
* primary goal: reduce global vars, slim down main file
(only do initialization of global stuff here, move everything else to a daemon class)
* properly close all open pop3/imap connections on shutdown
* throw/catch meaningful exceptions
* renamed IdleRunner/Idler run() methods to start() since 'run' suggests a blocking call (as in dialog.run())
removed sender_format from config
store both, sender name and address in mail objects
mailcollector: removed error messages from subject and sender strings
user script plugin: fixed script arg
mailchecker, plugins: pass both, new and all mails to MAILS_ADDED hook
mailchecker: fixed wrong count for filtered new mails
libnotify plugin: added some constants, enabled single notification mode, uncommented notification_id
spamfilter plugin: renamed variable
