Merge remote-tracking branch 'ispc3master/master'

install/lib/install.lib.php

install/lib/installer_base.lib.php

install/sql/incremental/upd_0049.sql

install/sql/incremental/upd_0052.sql

install/sql/incremental/upd_0055.sql

install/sql/incremental/upd_0065.sql

install/sql/ispconfig3.sql

interface/lib/classes/client_templates.inc.php

interface/lib/classes/custom_datasource.inc.php

interface/lib/classes/ispcmail.inc.php

interface/lib/classes/remote.d/admin.inc.php

interface/lib/classes/remoting.inc.php

interface/lib/classes/tform_base.inc.php

interface/lib/classes/tpl.inc.php

interface/web/admin/lib/lang/en_users.lng

interface/web/admin/lib/remote.conf.php

interface/web/admin/templates/server_config_web_edit.htm

interface/web/admin/users_edit.php

interface/web/client/client_edit.php

interface/web/client/client_message.php