coleifer/peewee 2.1.7

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Changes in 2.1.7

• Support for savepoints (Sqlite, Postgresql and MySQL) using an API similar to that of transactions.
• Common set of exceptions to wrap DB-API 2 driver-specific exception classes, e.g. peewee.IntegrityError.
• When pwiz cannot determine the underlying column type, display it in a comment in the generated code.
• Support for circular foreign-keys.
• Moved Proxy into peewee (previously in playhouse.proxy).
• Renamed R() to SQL().
• General code cleanup, some new comments and docstrings.

Bugs fixed

• Fixed a small bug in the way errors were handled in transaction context manager.
• #257
• #265, nest multiple calls to functions decorated with @database.commit_on_success.
• #266
• #267

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