add a new api endpoint for importing gpg keys
merge upstream branch
modified import_key to accept string instead of file object
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
Fixed "Add contact" dialog.

- (re-)added missing action to form
Merge pull request #511 from codeburg/fix_contact_add

Fixed "Add contact" dialog.
Removed APPEND_FD_CACHE and cached_open.

- Closes issue #356 (Get rid of cached_open)
- Refactored some file access to 'with' statement
Changed more file code to 'with' statement.

- Fixed leak in streamer.py
Fix stupid filtering bug
Fixed bulk_cache_add bug in drag & drop