[mms] Workaround broken MIME parts that cannot be binary decoded on the server.
[mms] Fix regression where creating a mailbox that is currently a container would not subscribe to that mailbox.
Correctly update tree status of mailbox when it is converted from container to real mailbox
Update for release
Released Horde_Imap_Client-2.19.6
Development mode for Horde_Imap_Client-2.19.7