Added server part of the aps installer.

install/sql/incremental/upd_0034.sql

install/sql/ispconfig3.sql

interface/lib/classes/aps_crawler.inc.php

interface/lib/classes/aps_guicontroller.inc.php

interface/web/sites/aps_cron_apscrawler_if.php

server/lib/classes/aps_base.inc.php

server/lib/classes/aps_installer.inc.php

server/mods-available/web_module.inc.php

server/plugins-available/aps_plugin.inc.php