Merge branch 'master' of http://git.ispconfig.org/ispconfig/ispconfig3

Florian Schaal

2014-10-17 22e5abc44844ffb4aa6a6eaf301d6fde633908e9

 install/sql/incremental/upd_0052.sql

New file
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ALTER TABLE `client` ADD `default_slave_dnsserver` INT( 11 ) UNSIGNED NOT NULL DEFAULT '1' AFTER `limit_dns_zone`;