* CT-2461: Work toward model deprecation
* CT-2461: Remove unneeded conversions
* CT-2461: Fix up unit tests for new fields, correct a couple oversights
* CT-2461: Remaining implementation and tests for model/ref deprecation warnings
* CT-2461: Changelog entry for deprecation warnings
* CT-2461: Refine datetime handling and tests
* CT-2461: Fix up unit test data
* CT-2461: Fix some more unit test data.
* CT-2461: Fix merge issues
* CT-2461: Code review items.
* CT-2461: Improve version -> str conversion
* Convert tests in dbt-adapter-tests to use new pytest framework
* Filter out ResourceWarning for log file
* Move run_sql to dbt.tests.util, fix check_cols definition
* Convert jaffle_shop fixture and test to use classes
* Tweak run_sql methods, rename some adapter file pieces, add comment
to dbt.tests.adapter.
* Add some more comments