Allow separate square feet adjusters to be applied independently

[bayareametro]

Allow separate square feet adjusters to be applied independently

[akselx]

@theocharides let me know if you think this is a general issue or just one related to my use case for leveraging sqft_per_job_adjusters for the exogenous adjustments.

[theocharides]

Hi @akselx - I think I need more code comments here to start, since it's not very straightforward. Also when I last looked at this I thought I saw a typo where the code comments for these lines are swapped.

The idea was that either telecommute rates get applied to future years, or the default rate gets applied, but in any case you can see it in the inputs based on what's turned on in run_setup.yaml without doing multiplication. But I see how that means you can't apply both at the same time without embedding the defaults in the future years.