Revision 424965

Update to 0.4.16.

* Part of the Sieve extprograms implementation was moved to Dovecot,
  which means that this release depends on Dovecot v2.2.26+.
* ManageSieve: The PUTSCRIPT command now allows uploading empty Sieve
  scripts. There was really no good reason to disallow doing that.
+ Sieve vnd.dovecot.report extension:
  + Added a Dovecot-Reporting-User field to the report body, which
    contains the e-mail address of the user sending the report.
  + Added support for configuring the "From:" address used in the
    report.
+ LDA sieve plugin: Implemented support for a "discard script" that is
  run when the message is going to be discarded. This allows doing
  something other than throwing the message away for good.
+ Sieve vnd.dovecot.environment extension: Added vnd.dovecot.config.*
  environment items. These environment items map to sieve_env_*
  settings from the plugin {} section in the configuration. Such values
  can of course also  be returned from userdb.
+ Sieve vacation extension: Use the Microsoft X-Auto-Response-Suppress
  header to prevent unwanted responses from and to (older) Microsoft
  products.
+ ManageSieve: Added rawlog_dir setting to store ManageSieve traffic
  logs. This replaces at least partially the rawlog plugin (mimics
  similar IMAP/POP3 change).
- doveadm sieve plugin: synchronization: Prevent setting file
  timestamps to unix epoch time. This occurred when Dovecot passed the
  timestamp as 'unknown' during synchronization.
- Sieve exprograms plugin: Fixed spurious '+' sometimes returned at the
  end of socket-based program output.
- imapsieve plugin: Fixed crash occurring in specific situations.

PR:		213926
Submitted by:	maintainer (Larry Rosenman)