Added ChecksummingStreamer
Ignore dotfiles in maildirs
Add the ability to save copies
1st draft of WERVD-style mailbox
Local draft storage using WERVD appears to work now
1st draft of event log
Fix a few minor buglets
Progress on event log
Improvements and bugfixes to filters (incl. issue #489)
Fix loading of moved Maildir messages (issue #451)
Fixed behavior when messages have disappeared