mail_user ADD COLUMN disablereplicator

We added the field disablereplicator with 103 incremental update, but it's missing in the ispconfig3.sql file.

ALTER TABLE mail_user ADD COLUMN disablereplicator CHAR(1) NOT NULL DEFAULT 'n';

We must add it to ispconfig3.sql and probably add it again in an incremental update, but only if it does not exist yet.