This change moves the score/altitude/priority comparisons to SchedulerJob,
keeping the lessThan QT-style sort predicate implementation, but clarifying the
intended order.
Accompanying documentation in SchedulerJob.h is perhaps a bit larger for these
functions than for the rest of SchedulerJob, but more documentation should come
anyway.
FIXME to remind to refactor scheduler job sorting in one separate function.
FIXME to indicate there is probably a wrong sort on score.
FIXME to use std::sort because qSort is deprecated, but that's minor.