* Update task-essential-etch build recipe to exclude the kde-desktop
task since it won't fit on the CD.
* Move kde-desktop to end of task.list for same reason.
* Update task-full-etch to current tasksel.
Only enable the rescue isolinux targets for etch.
I hope at least some of the etch stuff (like tools/boot/etch) can be used
for the daily CD builds that build using d-i daily builds.