fix: create sieve directory / change to maildir before symlinking

Carsten Schoene

2014-01-01 097ad60de74b889d8055bd59df3e6ad0280f1db2

 install/sql/incremental/upd_0050.sql

New file
@@ -0,0 +1,2 @@
ALTER TABLE `dns_slave` DROP INDEX `origin`;
ALTER TABLE `dns_slave` ADD CONSTRAINT `slave` UNIQUE (`origin`,`server_id`);