Reorganized tests, fixed aggregationFieldOptions bug, renamed newQuestion

frontend/src/metabase-lib/lib/Question.js

frontend/src/metabase-lib/lib/Question.spec.js

frontend/src/metabase-lib/lib/queries/NativeQuery.spec.js

frontend/src/metabase-lib/lib/queries/StructuredQuery.js

...tend/src/metabase-lib/lib/queries/StructuredQuery.spec.js

frontend/src/metabase/__support__/sample_dataset_fixture.js

...tabase/admin/datamodel/components/PartialQueryBuilder.jsx

...ents/actions/SummarizeBySegmentMetricAction.integ.spec.js

...nents/actions/SummarizeBySegmentMetricAction.unit.spec.js

frontend/src/metabase/query_builder/actions.js