Message::delete sets the FT_UID flag.  Fixes #30 Fixes #46
Merge pull request #54 from ctalbot/ctalbot-use-uid-msg-delete

Message::delete sets the FT_UID flag.  Fixes #30 Fixes #46
Decode attachment filename
Apply \imap_utf8 on all message headers before parsing them
Do not manually re-decode subject
Fix message content decoding