KDE isn't used by Porteus anymore, Razor is.  No sense in keeping these
around any longer.

Signed-off-by: The Doctor <drwho@virtadpt.net>
pcmanfm isn't used by Porteus anymore, SpaceFM is.

Signed-off-by: The Doctor <drwho@virtadpt.net>
LXDE and PCmanFM aren't used anymore.

Signed-off-by: The Doctor <drwho@virtadpt.net>