Expert-based limits

[marcua]

• keep settings.ORCHESTRA_MAX_AUTOSTAFF_TASKS_PER_DAY as a backstop
• eliminate ORCHESTRA_MAX_AUTOSTAFF_HOURS_PER_DAY
• create Worker.max_autostaff_hours_per_day
• hide form if max_autostaff_hours_per_day == 0
• add min(max_autostaff_hours_per_day, what_expert_requested) to the autostaff logic

[thisisdhaas]

with max_autostaff_hours_per_day >= 0:

with max_autostaff_hours_per_day == 0:

Also you get 404s if navigating directly to the availability config URL (/orchestra/accounts/availability_settings/)

[thisisdhaas]

edited a worker's max_autostaff_hours_per_day to be 0, and autostaffing didn't happen. Increased it to 8 hours per day, and it did.