#116 DBUnit export should support standard XML format

[Joachim Simon]

Because the flat XML format has some drawbacks regarding NULL values and meta data extraction (s. http://dbunit.sourceforge.net/apidocs/org/dbunit/dataset/xml/FlatXmlDataSet.html\), we decided to use the standard XML format, which is more verbose, but in itself complete.
We would very much appreciate the support of the standard XML format for exporting test data.

[Julen Parra]

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OK, I'll have a look.