[FIX] Corrected overrelease which occured in some cases when parsing TNEF attachments.
Enable MallocScribble to better debug NSZombies.
[FIX] If only one account is configured in Mail.app don't force the From: dropdown to be shown unless there are multiple gpg keys available for that account. [#642 state:fixed]
Merge branch 'dev' of https://github.com/GPGTools/GPGMail into dev