subtract_pk: Subtract various `pkproto` objects from a `pk` object
Description
Subtract various `pkproto` objects from a `pk` object
Usage
subtract_pk(pk_obj, object, objectname)
Value
The `pk` object modified by the subtraction.
Arguments
- pk_obj
The `pk` object
- object
The `pkproto` object to be subtracted
- objectname
The name of the `pkproto` object to be subtracted