#7 Show the first possible schedules while computing the rest

[Keith Lea]

When the user clicks Next to see his or her possible
schedules, the Scheduler generates all possible
schedules, then shows them. The Scheduler should simply
generate them in real time, so the user can start
browsing schedules without having to wait for the rest
to form. This may also produce a side-effect of showing
some computed schedules even when the system ran out of
memory.