When a database wants to use ACCS from the start, when the record is loaded
into the IOC, the init_record() function needs to look at it.
The new way is to set ACCS != 0.0 and ACCL == 0.0 and then ACCS takes over.
The compatible (call it old ?) way is to have ACCS == 0.0, and then ACCL
is used.