Add support for sqlalchemy 1.4+

• This also includes support for 2.0.0, which is still in beta.

Fixes #964 (closed)

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• c11cc2ab - Fix some corner cases

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• 2ff4f9b7 - Add debugging info.

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• fdab1f4a - Rollback on pending rollback exception.

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• 50e64d54 - Fix abort semantics.

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• 973e72da - Add exception logging.

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• c17b9baf - Use scoped session.

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• 2f1ce550 - Use scoped_session in dbconnection.

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• 9d2c5168 - Do not abort transaction in tests.

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• c4331774 - Don't create new sessions.

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• b5bac450 - Try out with expire_on_commit=False.

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• c435baf5 - Use scoped_session.

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• 061bd63a - Expunge all objects so they don't expire randomly after.

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• dc987cb9 - Run tests with multiple workers and threads.

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• 08c48972 - Run tests wtith py3.9

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• 056a3126 - Restart workers often.

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• 9f78c98d - Don't log to stdout.

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• a8a0a83a - Qa and coverage fixes.

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• 13105782 - Don't use threads.

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• f675323e - Fix isort errors

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• aba05599 - Use threads not more workers.

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