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
}
	/**
	 * Finds a parameter by name in this module and the included modules.
	 * 
	 * @param name
	 *            The parameter name.
	 * @return The parameter, if found, otherwise null.
	 */
	public DesignElement findParameter( String name )
	{
		return resolveNativeElement( name, PARAMETER_NAME_SPACE );
	}
	/**
	 * Finds a cube element by name in this module and the included modules.
	 * 
	 * @param name
	 *            the element name
	 * @return the cube element, if found, otherwise null
	 */
	public DesignElement findOLAPElement( String name )
	{
		return resolveNativeElement( name, CUBE_NAME_SPACE );
	}
	/**
	 * Finds a level element by name in this module and the included modules.
	 * 
	 * @param name
	 * @return
	 */
	public DesignElement findLevel( String name )