XFCE4 Install under Dapper

[Jani Monoses]

> Actually, XFCE4 is a meta package that will install enough components to  
> have a XFCE4 desktop, as mentioned though, XFCE4 is not in its prime 
> right now. 

xfce4 is no longer recommended, use xubuntu-desktop instead. Although 
for those wishing to use xfce4 without the rest of xubuntu apps I guess 
the former metapackage will need to be updated to reflect the current 
changes.

Jani