Dev accessibilities

[nick-fournier-rsg]

trafficstars

Draft pull request for disaggregate accessibilities. Works with 1 and 2 zone models. Tested but some issues remain:

• Optional sampling and soft-merge methods using kmeans/naive bayes require sklearn package not part of testing suite. Disabled these imports for now. However, the pre-sampling method could/should be improved to use the weighted sampling method used in activitysim.
• difficulty testing multiprocess, it appears vehicle model does not pass mp test. Unsure if related or isolated issue.