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
else
						return Boolean.TRUE;
				}
				catch ( NumberFormatException e )
				{
					throw new CoreException(
							ResourceConstants.CONVERT_FAILS,
							new Object[]{
									source.toString( ), "Boolean"
							} );
				}
			}
		}
		else
		{
			throw new CoreException( 
					ResourceConstants.CONVERT_FAILS,
					new Object[]{
							source.toString( ), "Boolean"
					});
		}
	}
	/**
	 * Number -> Date
	 * 		new Date((long)Number)
	 * String -> Date
	 * 		toDate(String)  
	 * @param source
	 * @return
	 * @throws BirtException