Proposed patch for showing originating query on error

This just adds an exception to the existing backend exception showing
the originating query.

Given that the backend doesn't show us this information, a few people
have asked for it.

Dave

*** 426,437 ****
--- 432,451 ----

           StatementResultHandler handler = new StatementResultHandler
();
           result = null;
+         try
+         {
               connection.getQueryExecutor().execute(queryToExecute,
                                                 queryParameters,
                                                 handler,
                                                 maxrows,
                                                 fetchSize,
                                                 flags);
+         }
+         catch( SQLException ex )
+         {
+             handler.handleError(new PSQLException(GT.tr("Original
Query -->") + queryToExecute.toString(queryParameters),
PSQLState.UNKNOWN_ST
ATE));
+             throw ex;
+         }
           result = firstUnclosedResult = handler.getResults();
       }