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GdaFieldAttributes has been renamed GdaColumn
The GdaParameter is now an object, and it is extensively used within 
	    GdaParameterList objects. Each GdaParameterList object represent a 
	    vector of parameters (which may or may not have values assigned) and is the base of the
	    GdaDataModelIter iterator object. The GdaParameter API has been
	    altered.
The GdaExport class has been removed, the features it offered are now implemented
	    in each GdaDataModel object.
GdaSelect has been renamed 
	    GdaDataModelFilterSQL
The GdaTable class has been replaced by the
	    GdaDataModelQuery class: it's a data model which can refresh itself and can be
	    configured to be updatable, it's not limited to a database table.
The GdaXmlDatabase has been removed and the default database is now SQLite
	    which is a complete RDBMS in a file
All the gda_xql_*() functions have been removed because they were unused and unmaintained.
	  
The 'xml' provider has been removed as it did not work correctly and has been replaced by the SQLite provider as the provider to have serverless databases.