Urbansim-templates

- narrows the output of `utils.get_data()` to include only the columns requested (plus the index of the primary table) -- previously Orca had also provided some extra columns such as join keys

- adds a new function `utils.get_data()` to assemble data from Orca, automatically detecting columns included in model expressions and filters

- implements `SegmentedLargeMultinomialLogit.run_all()`

- fixes a model expression persistence bug in the small MNL template

- fixes a bug to allow large MNL simulation with multiple chooser tables

- improves installation and testing

- adds an `interaction_terms` parameter that users can manually pass to `LargeMultinomialLogitStep.run()`, as a temporary solution until interaction terms are fully handled by the templates
- also adds a `chooser_batch_size` parameter in the same place, to reduce memory pressure when there are large numbers of choosers