Log Message:
dovecot2-pigeonhole: updated to 0.5.18

v0.5.18

	- duplicate: Users without a home directory can crash with Sieve when
	  using duplicate database. v2.3.17 regression.
	- imapsieve: When mail was expunged when processing imapsieve events, a
	  crash could occur. Fixes Panic: file mail-index-map.c:
	  line 558 (mail_index_map_lookup_seq_range): assertion failed: (first_uid > 0)
	- managesieve-login: Proxy didn't support forwarding the forward_* passdb fields.
	- redirect: Sieve would crash if redirect after keep-equivalent action failed.
	- sieve: Interpreter crashes when the Sieve index extension is used with
	  index zero.
	- vnd.dovecot.filter: Envelope sender string may become corrupted when
	  Sieve scripts are using vnd.dovecot.filter. This could end up
	  corrupting mbox's From line and return wrong envelope sender string in
	  Sieve tests.