If an app is hard, the scheduler always does the deadline check,
even if the client has no other jobs for this project.
And the estimated wallclock duration is multiplied by 1.3,
to avoid sending jobs to hosts that will barely make the deadline.
Hard apps are marked by setting weight = -1.
This is a total kludge, to avoid adding another field to app.
svn path=/trunk/boinc/; revision=15607
David Anderson