A few style changes, autopep, and adding a get_patient_id function

Changes are:

- Ran autopep8 on these files
- Did some manual line-length fixes
- Added get_patient_id function
- Added --debug-patient-id flag (which processes all input, but then post-filters to keep only a specific patient ID)
Ah, interesting. So in cases like this, I'm unclear about whether I should ignore the 79-char max?