Add Jobs index user interface
Fix copy-paste mistake
Implement delete singlejob for UI
Commit db session before deleting job

These seems to help with some race issues when using SQLite
Implement rerun single job
Typo fix: Mark job state after marking task states
Allow ordering job list by different task counts

queued / running / failed / done
Allow NULL values for Job.state
Allow "next" request arg for rerun single job
Implement single job user interface
Add Pause/Unpause function to single job view
When pausing job, stop running tasks
Fix minor typo in logstring
Call scheduler on unpausing/rerunning a job
Reset attempts on tasks when rerunning a job
Remove microsecond precision from times in job UI

The microsecond precision adds no real value and only clutters up the
view.
Round task percentages to two fractional digits
Make sure tasks are always ordered by frame
Allow altering frame selection on job via UI
Allow changing scheduler parameters for job via UI