conf: Package groups improvement

Mostly based on Fedora 18 comps file - added translations, fonts, xfce plugins etc.
Ssome unneded packges removed from xfce group
Two separate environment (KDE and XFCE).

conf/qubes-kickstart.cfg

@@ -11,6 +11,10 @@ repo --name=dom0-updates --baseurl=file:///tmp/qubes-installer/yum/dom0-updates/
 %packages
 @base-x --nodefaults
 @kde-desktop-qubes
+@xfce-desktop-qubes
+@xfce-extra-plugins
+@fonts
+@hardware-support
 @qubes
 @anaconda-tools
 %end