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
}
			catch ( NumberFormatException e )
			{
				throw new CoreException(
						ResourceConstants.CONVERT_FAILS,
						new Object[]{
								source.toString( ), "BigDecimal"
						});
			}
		}
		else
		{
			throw new CoreException(
					ResourceConstants.CONVERT_FAILS,
					new Object[]{
							source.toString( ), "BigDecimal"
					} );
		}
	}
	/**
	 * 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