Add test cases for support of environment variables

[jonrkarr]

Test cases

• ALGORITHM_SUBSTITUTION_POLICY
• VERBOSE

The attributes of the Docker image can be used to determine which environment variables the simulator supports.

However, I can't think of a way to automatically formulate test archives to probe support because we're not asking simulators to declare the alternative algorithms that they recognize. This would need to be added to the simulator specs. However, we want this to be implemented through the hierarchy of KiSAO terms, rather than something that individual simulation tools need to curate.