- udpate to 3.14:
* TLS support rewritten from scratch
** New configuration statement: tls.handshake-timeout
* Fix idle timeout handling (imap4d and pop3d daemons)
* New function mu_mailbox_append_message_ext
* mail utility
** new command: unread (U)
** message state is preserved when copying to another mailbox
* Build requires GNU bison and flex
* All parsers and scanners are rewritten in reentrant form
* Support for mimetypes incorporated to the libmailutils library
* Maildir and MH mailboxes
** Change the way of storing the envelope information
** Message scanner completely rewritten
* Bugfixes
** Fix timezone calculation (see https://savannah.gnu.org/bugs/?61239)
** Fixed some memory and fd leaks
** Fixed corner case in mu_make_file_name_suf function