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
* 
	 * @param value
	 *  		the input value to validate
	 * @return the formatted string
	 */
	static public String getDisplayValue( Object value )
	{
		if ( value == null )
			return null;
		if ( value instanceof Date )
		{
			DateFormatter formatter = new DateFormatter( DEFAULT_LOCALE );
			formatter.applyPattern( DEFAULT_DATETIME_FORMAT );
			return formatter.format( (Date) value );
		}
		else if ( value instanceof Float )
		{
			NumberFormatter formatter = new NumberFormatter( DEFAULT_LOCALE );
			return formatter.format( ( (Number) value ).floatValue( ) );
		}
		else if ( value instanceof Double )
		{
			NumberFormatter formatter = new NumberFormatter( DEFAULT_LOCALE );
			return formatter.format( ( (Number) value ).doubleValue( ) );
		}
		else if ( value instanceof BigDecimal )
		{
			NumberFormatter formatter = new NumberFormatter( DEFAULT_LOCALE );
			return formatter.format( ( (BigDecimal) value ) );
		}