3.9.6

• Support nesting the Database instance as a context-manager. The outermost block will handle opening and closing the connection along with wrapping everything in a transaction. Nested blocks will use savepoints.
• Add new session_start(), session_commit() and session_rollback() interfaces to the Database object to support using transactional controls in situations where a context-manager or decorator is awkward.
• Fix error that would arise when attempting to do an empty bulk-insert.
• Set isolation_level=None in SQLite connection constructor rather than afterwards using the setter.
• Add create_table() method to Select query to implement CREATE TABLE AS.
• Cleanup some declarations in the Sqlite C extension.
• Add new example showing how to implement Reddit's ranking algorithm in SQL.

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