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
* <ul>
	 * <li>if data type is <code>PARAM_TYPE_DATETIME</code>, then the value
	 * must be <code>java.util.Date<code>.</li>
	 * <li>if the data type is <code>PARAM_TYPE_FLOAT</code>, then the value must
	 * be <code>java.lang.Double</code>.</li>
	 * <li>if the data type is <code>PARAM_TYPE_DECIMAL</code>, then the value must
	 * be <code>java.math.BigDecimal</code>.</li>
	 * <li>if the data type is <code>PARAM_TYPE_BOOLEAN</code>, then the value must
	 * be <code>java.lang.Boolean</code>.</li>
	 * <li>if the data type is <code>PARAM_TYPE_STRING</code>, then the value must
	 * be <code>java.lang.String</code>.</li>
	 * </ul>
	 * 
	 * @param dataType
	 *  		the data type of the input value
	 * @param format
	 *  		the format pattern to validate
	 * @param value
	 *  		the input value to validate
	 * @param locale
	 *  		the locale information
	 * @return the formatted string
	 */
	static public String getDisplayValue( String dataType, String format,
			Object value, ULocale locale )
	{
		if ( value == null )
			return null;
		if ( StringUtil.isBlank( format ) )
		{