Add a trash emptying command (and determine the sections needing modification for that).

And another thing, if we're going to have messages which are trashed, and we're not going to have the semantic concept of "in a folder", then does it make sense to have a Trash folder, or just a list of messages which have been trashed? Think on this. One requires moving a message into another folder, another requires adding a flag to a message and storing the unique combination of folder/identifier in some sort of array. Not sure if there's any real difference (regarding the specification). -dave

Issue done.