Note that I only went through the files and fix whatever the PEP8 script for
vim reported as incorrect, but I had not actually paid attention to the
text, so there might still be inconsistencies (like for example strange
variable names, etc.). Also only scan_opt.py is done completely, scan_op.py
still has a bunch of PEP8 inconsistency.

After the fix I only run the tests in scan_module/tests.py and they passed
so I assume I had not introduced any bug in my PEP8 fixes.