tasksel now allows selecting the desktop, and d-i has dropped the boot
menu desktop selection, so we no longer need to have desktop boot
menus on CDs.
CD images for specific desktops (xfce/kde/mate/etc) should still
override the default tasksel desktop.
debian-cd currently expects there to always be isolinux/desktop/*
files and a dtmenu.cfg file, failing if they are missing. Make it so
debian-cd can cope whether those files are present or not.
Joey Hess
Steve McIntyre
Steve McIntyre