Things to do

Changes I'd like to make:

 * Fix task generation; remove the generated task lists from the
   module altogether and make the build generate them each time. I
   know Joey's been wanting this for a while, and it's sensible

 * Allow (limited) builds without a local mirror. Netinst and business
   card images should be possible that way - they don't need a full
   set of packages to be present.