I was doing the check on each call to get_app_version().
But it turns out this gets called during the job scan,
before calling add_result_to_reply(),
which is where n_jobs_today gets incremented.

Solution:move the check to the loop (in sched_score.cpp)
where add_result_reply() is called.

Also: fix bad logic in work_needed() where a global check
(on job limit in user project prefs)
was being done inside a loop over resources.