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The GdaClient usage has remained unchanged except for some small API alterations and
      a specific API has been defined to create and destroy databases.
The GdaError class has been renamed to GdaConnectionEvent and
      can now convey not only errors but also other kind of events which have happened on a connection
The GdaConnection usage has remained by far unchanged, but some of its API have had
      some alterations (finding the equivalent is trivial). The most noticeable change being that
      the gda_connection_escape_string() has been removed because string escaping is 
      now done by a GdaDataHandler object which each 
      GdaServerProvider provides for each data type.