Do not delay or set to an error if an exception is raised in dequeueMessage, because invoke or invokeGroup should never emit an exception, so an exception should be nothing with a message itself.

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  Remove locking.
  Pool scheduled queries.
  Use self._query instead of database's query.
Remove unused variables.
Remove LOGs which occur on normal execution path.
Remove commented out LOGs.


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Use the new method everywhere instead of directly calling database's query method.
Add a "ping" query at request begining to offer transactionnal use a reconnection opportunity.


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for transactions in multiple currency.



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Make getConnection, cleanupConnections, getFinishedOrAborted, setFinishedOrAborted, forceReconnection, closeConnection private methods.
Remove useless try block in _finish.


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returning unformatted value).



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More support for hasBaseData. Removal of External Web Page (continued). Some smart behaviour in property disovery when title contains mirrosoft.

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Remove volatile-attribute-related code, it has nothing to do on such class.
Rename the flag used to know wether _abort or _finish has to be called.
Initialise that flag during _begin.


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