Getter and Setter for order setbacks should have the same name

The getter for the maximum setbacks of an order is
spooler_job.setback_max

but the name of the setter is
spooler_job.max_order_setbacks=int

Both (getter and setter) should have the same name.
setter: spooler_job.max_order_setbacks=int
getter spooler_job.max_order_setbacks

spooler_job.setback_max should be deleted in the documentation (also the documented but non existent setter spooler_job.setback_max=int).
It should also be marked as deprecated in the code.