Update Host so groups can be pulled from host class and set from host class. Fixes the groups so they can be added/removed as well.  Fix printer add so it happens to actually associate the files.

git-svn-id: https://svn.code.sf.net/p/freeghost/code/trunk@1500 71f96598-fa45-0410-b640-bcd6f8691b32
ADD README File.