Use the label's of 'check here' items to allow selecting of the checkbox.  Make Group page handle many of the host association stuff through the group class rather than directly on the page.  Printers are handled at the printer class as well.  Made the checkboxes for the host and group of default printers a radio rather than a checkbox as you can only set one default at a time.

git-svn-id: https://svn.code.sf.net/p/freeghost/code/trunk@2408 71f96598-fa45-0410-b640-bcd6f8691b32