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
{
		session = theSession;
		
		this.nameHelper = new ModuleNameHelper( this );
		
		setID( getNextID( ) );
		addElementID( this );
		versionMgr = new VersionControlMgr( );
	}
	/**
	 * Returns the design session that represents the designs that the user has
	 * open and user preferences.
	 * 
	 * @return the design session
	 */
	public DesignSession getSession( )
	{
		return session;
	}
	/**
	 * Finds a shared style in this module itself.
	 * 
	 * @param name
	 *            Name of the style to find.
	 * @return The style, or null if the style is not found.
	 */
	public StyleElement findNativeStyle( String name )
	{
		return (StyleElement) nameHelper.getNameSpace( STYLE_NAME_SPACE )
				.getElement( name );