Flask-db2

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Wrapping connection.close with a try/except to avoid blow-ups.

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Revisits BUGFIX 4 - another Windows `lf+cr` issue.

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BUGFIX 4 - Resolves an issue where on Windows the error message was including `lf+cr`
and the RegEx wasn't catching this.

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Added try_parse method to DB2Error.

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Added DB2Error class to handle parsing out error codes/message.

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Checking for None type cursor/row in row_factory and returning None.