Exception aware eZDB

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Exception aware eZDB
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Synopsis
========

eZDB can now be made exception aware by setting an error handling variable:

Usage
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This syntax will globally instruct each eZDBInterface instance to use exception based error handling::

    eZDB::setErrorHandling( eZDB::ERROR_HANDLING_EXCEPTIONS );

A similar syntax can be used at instance level to set this behaviour only for a specific eZDBinterface instance:

    eZDB::instance()->setErrorHandling( eZDB::ERROR_HANDLING_EXCEPTIONS );

Another constant represents the backward compatible, default handling mode: eZDB::ERROR_HANDLING_STANDARD.

Effect
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With exception based handling, any error occuring while executing a query will throw an eZDBException instead of either
returning false (standard behaviour) or exiting with the red squared "A database transaction has failed".

In the later case (inside a transaction), the query is still automatically rollbacked, but exception based handling
will prevent Exponential from exiting directly and will either let you resume work or exit properly.