Changes 2.4.8:
* QUOTA and MYRIGHTS IMAP extension support.
* IMAP compression (COMPRESS=DEFLATE) when supported by server
* making opening attachment easier by saving them in a directory
* downloadable images when using Webkit html widget
* faster opening of the compose window.
* text searching enabled in the WebKit html viewer.
* options to hide toolbars and other parts of the UI (useful on netbooks etc).
* For laptop/wifi users: not trying to reach POP3 servers while disconnected,
  and instead checking immediately on reconnection.
* infinite loop avoided.
* avoid crashes when manually verifing GPG signature.

(adam)