BayDAG Contribution #2: Enhanced Disaggregate Accessibility Merging

[dhensle]

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This pull request gives the user greater flexibility to join disaggregate accessibilities to the households / person tables. The original design for the model just joined the disaggregate accessibilities to the household table by a set of auto ownership and home zone. This was insufficient for the purpose of joining all auto ownership levels created in the disaggregate accessibilities model so they could be applied to the alternatives in the auto ownership model.

See the SANDAG ABM3 configs for an example implementation: yaml and annotator.

Required for SANDAG ABM3 production? -- yes