Bug 197228 Need updaet createdBy info when serialize the module
When open module, designer will pass the property map which contains the createdBy info. this info should be retained by moduleHandle and then be updated and written when doing serialization. Note if this info is null, model should not update it during serialization. This could happen for api users or third-party designer. For BIRT designer, it will guarantee this value always not null.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/core/Module.java
* be defined in several translations, one translation per locale.
	 */
	protected TranslationTable translations = new TranslationTable( );
	/**
	 * The property definition list of all the referencable structure list
	 * property. Each one in the list is instance of <code>IPropertyDefn</code>
	 */
	private HashMap referencableProperties = null;
	/**
	 * Accumulates errors and warnings during a batch operation. Each one is the
	 * instance of <code>Exception</code>.
	 */
	protected List allExceptions = new ArrayList( );
	/**
	 * The validation executor. It performs the semantic validation and sends
	 * validation event to listeners.
	 */
	protected ValidationExecutor validationExecutor = new ValidationExecutor(
			this );
	/**
	 * The listener list for validation event.
	 */
	private List validationListeners = null;
	/**
	 * The file name. Null means that the module has not yet been saved to a
	 * file.
	 */
	protected String fileName = null;
	/**
	 * The system id which is needed for resolving relative URIs. It can be a