Add view to add annual leave in bulk

[moshthepitt]

• Check all active staff members that do not have leave days
• Generate llist of the users with with formsets for the annual leave records of each user
• Create the records when saved

[moshthepitt]

Optionally add a flag to notify admin that there are users with no annual leave records

[moshthepitt]

l = Leave.SICK
d = 10
y = 2019
for item in StaffProfile.objects.exclude(annualleave__leave_type=l, annualleave__year=y):
    annual_leave = AnnualLeave(year=y, staff=item, allowed_days=d, leave_type=l)
    annual_leave.save()

l = Leave.REGULAR
d = 10
y = 2019
for item in StaffProfile.objects.exclude(annualleave__leave_type=l, annualleave__year=y):
    annual_leave = AnnualLeave(year=y, staff=item, allowed_days=d, leave_type=l)
    annual_leave.save()