smarter inspect() #38
Description
Right now inspect() only detects the first tie between objects (i.e. individual and household but not individual to dwelling). This is because of the chuck of codes below. It only checks that the id columns of both entity and related entity are in the column names of the other or not. Hence, it does not detect if both entities share the same id columns that are not their primary id variables. To make this possible, there should be a way to label the all id columns so they can be checked.