[K12OSN] Starting work on 4.2.1

[Eric Harrison]

I'm finally back from three week's worth of vacation, R&D work, &
conferences.

I started work on K12LTSP 4.2.1. So far I have included all of the
security & bug fixes.

What is new that should be considered for inclusion? Off the top of
my head:

 	* the official Fedora Extras repository
 	* Inkscape

Is the LDAP script ready to be included? (perhaps just in /opt/ltsp/scripts?)

-Eric