Bug 152443 Support boolean type in data set
Support boolean type in data set. It'll cause some data transform issue with absence of boolean type.
core/org.eclipse.birt.core/src/org/eclipse/birt/core/data/DataTypeUtil.java
source.toString( ), "Integer"
					} );
		}
	}
	/**
	 * Boolean -> BigDecimal
	 * 		true 	-> 1
	 * 		others 	-> 0 
	 * Date -> BigDecimal
	 * 		Date.getTime();
	 * String -> BigDecimal
	 * 		new BigDecimal(String);
	 * @param source
	 * @return
	 * @throws BirtException
	 */
	public static BigDecimal toBigDecimal( Object source ) throws BirtException
	{
		if ( source == null )
			return null;
		if ( source instanceof BigDecimal )
		{
			return (BigDecimal) source;
		}
		else if ( source instanceof Number )
		{