recurring tasks with high priority are always above other tasks

[ardunn]

I.e., E5 I5 task recurring after 30 days will always appear prioritized above a E1 I1 task.

This might be fixed by just hiding the task until it would normally be overdue

If task is due in 5 days, and recurs every 10 days, and is completed, hide the task until 5 days from now

[ardunn]

also, recurring tasks should scale more aggressively based on their recurrence interval #45