Added powerdns support for debian Linux in the installer.

install/dist/conf/centos52.conf.php

install/dist/conf/centos53.conf.php

install/dist/conf/debian40.conf.php

install/dist/conf/fedora9.conf.php

install/dist/conf/gentoo.conf.php

install/dist/conf/opensuse110.conf.php

install/install.php

install/lib/installer_base.lib.php

install/sql/powerdns.sql

install/tpl/pdns.local.master

install/update.php