* tests/test_transaction.py

	(TransactionTestCase.test_failed_commit): Expect IntegrityError
	instead of OperationalError.

	* psycopg/pqpath.c (exception_from_sqlstate): new function that
	converts an SQLSTATE error code to the corresponding exception
	class.
	(pq_raise): use exception_from_sqlstate() to pick which exception
	to use when working with protocol version 3.
	(pq_complete_error): Let pq_raise() pick an appropriate exception
	rather than forcing OperationalError.

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