Add distance to state model in SpeedTraversalModel and other small fixes

[nreinicke]

Some small fixes uncovered during a recent debugging session:

• speed traversal model didn't add distance during the state estimation
• adds a test to priority queue to make sure it works properly with reverse costs
• corrects the expected keys for energy time and distance units
• for the CLI app, sets --chunksize to only a long argument since the short argument -c conflicts with --config-file

[robfitzgerald]

@nreinicke this looks fine but there is a merge conflict to address

[robfitzgerald]

🎸