Add hook-ins for elements.  Move all the location from boot/snapin standpoint to location.  Create the hook to handle the location needed stuff. Edit the ubuntu and arch FOGSnapinReplicator to have descriptions of snapin rather than image.

git-svn-id: https://svn.code.sf.net/p/freeghost/code/trunk@2482 71f96598-fa45-0410-b640-bcd6f8691b32