Log Message:
Update dovecot2-pigeonhole to 0.4.7, a leaf package and this update is
needed to dovecot2-pigeonhole compatible with Dovecot 2.2.16.

v0.4.7 19-03-2015 Stephan Bosch <stephan@rename-it.nl>

	* editheader extension: Made protection against addition and deletion of
	  headers configurable separately. Also, the `Received' and `Auto-Submitted'
	  headers are no longer protected against addition by default.
	* Turned message envelope address parse errors into warnings.
	* The interpreter now accepts non-standard domain names, e.g. containing '_'.
	+ Implemented the Sieve index extension (RFC 5260).
	+ Implemented support for the mboxmetadata and servermetadata extensions
	  (RFC 5490).
	+ Implemented new sieve commands for the doveadm command line utility. These
	  commands are currently limited to ManageSieve operations, but the other
	  current sieve tools will be migrated to doveadm in the near future as well.
	+ Added more debug output about binary up-to-date checking.
	+ Added script metadata to binary dump output.
	- Fixed Sieve script binary up-to-date checking by normalizing the script
	  location.
	- The Sieve interpreter now flushes the duplicate database during start phase
	  of result execution rather than commit phase. This makes sure locks on the
	  duplicate database are released as soon as possible, preventing contention.
	- Performed a few optimizations in the lexical scanner of the language.
	- Fixed bug in `:matches' match-type that made a pattern without
	  wildcards match as if there were a '*' at the beginning.
	- Fixed crash in validation of the string parameter of the comparator tag.
	- extprograms extension: Made sure supplemental group privileges are also
	  dropped. This was a problem reported by Debian lintian.
	- Fixed bug in handling of binary errors for action side-effects and message
	  overrides.
	- file script storage: Restructured storage initialization to address
	  backwards compatibility issues.
	- dict script storage: Fixed small memory allocation bug.