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
{
		return resolveElement( name, null, MetaDataDictionary.getInstance( )
				.getElement( ReportDesignConstants.LEVEL_ELEMENT ) );
	}
	/**
	 * Returns the next element ID and increments the ID. Used to assign an ID
	 * to new elements.
	 * 
	 * @return The ID to assign to the new element.
	 */
	public long getNextID( )
	{
		return elementIDCounter++;
	}
	/**
	 * Adds an element to the id-to-element map. Does nothing if IDs are not
	 * enabled. Should be called only from the
	 * {@link org.eclipse.birt.report.model.command.ContentCommand ContentCommand}.
	 * 
	 * @param element
	 *            The new element to add.
	 */
	public void addElementID( DesignElement element )
	{
		assert idMap != null;
		assert element.getID( ) > 0;
		Long idObj = new Long( element.getID( ) );
		assert !idMap.containsKey( idObj );
		idMap.put( idObj, element );