Bug 145741 Could not set the value of Boolean parameter as 0 or 1
Description: Could not set the value of report scalar boolean parameter as 0 or 1. Steps to reproduce: 1.Create a report parameter, boolean type, Combo Box display type. 2.Add the value as 0, failed. Expect result: Could set integer value to boolean type parameter.
core/org.eclipse.birt.core/src/org/eclipse/birt/core/data/DataTypeUtil.java
* Number -> Boolean
	 * 		0 		-> false
	 * 		others 	-> true
	 * String -> Boolean
	 * 		"true" 	-> true (ignore case)
	 * 		"false" -> false (ignore case)
	 * 		other string will throw an exception
	 * Date -> Boolean
	 * 		throw exception
	 * @param source
	 * @return
	 * @throws BirtException
	 */
	public static Boolean toBoolean( Object source ) throws BirtException
	{
		if ( source == null )
			return null;
		
		if ( source instanceof Boolean )
		{
			return (Boolean) source;
		}
		else if ( source instanceof Integer )
		{
			int intValue = ( (Integer) source ).intValue( );
			if ( intValue == 0 )
				return new Boolean( false );
			return new Boolean( true );
		}
		else if ( source instanceof BigDecimal )