Bug 155478 [regression]Numbers in cascading group displays incorrectly
Description: Numbers in cascading group displays incorrectly. Steps to reproduce: 1. New sample data source and dataset from table ORDERS. 2. New a cascading group with two sub parameters, the first is from STATUS and the second is from ORDERNUMBER. 3. Preview 4. Select a status value in poped up parameter dialog, see ordernumber list Expected result: See 10100, 10101, such kind of format. Actual result: I saw 10.100, 10.167..., I just listed out the numbers as example
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/util/ParameterValidationUtil.java
{
			DateFormat formatter = DateFormat.getDateTimeInstance(
					DateFormat.MEDIUM, DateFormat.MEDIUM, locale );
			return formatter.format( (Date) value );
		}
		else if ( DesignChoiceConstants.PARAM_TYPE_FLOAT
				.equalsIgnoreCase( dataType )
				|| value instanceof Float || value instanceof Double )
		{
			if ( value instanceof Float )
			{
				NumberFormat formatter = NumberFormat
						.getNumberInstance( locale );
				return formatter.format( ( (Number) value ).floatValue( ) );
			}
			else
			{
				NumberFormat formatter = NumberFormat
						.getNumberInstance( locale );
				return formatter.format( ( (Number) value ).doubleValue( ) );
			}
		}
		else if ( DesignChoiceConstants.PARAM_TYPE_DECIMAL
				.equalsIgnoreCase( dataType )
				|| value instanceof BigDecimal )
		{
			NumberFormat formatter = NumberFormat.getNumberInstance( locale );
			return formatter.format( ( (BigDecimal) value ) );
		}
		else if ( DesignChoiceConstants.PARAM_TYPE_INTEGER