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 shared style in this module and its included modules.
	 * 
	 * @param name
	 *            Name of the style to find.
	 * @return The style, or null if the style is not found.
	 */
	public StyleElement findStyle( String name )
	{
		return (StyleElement) resolveElement( name, null, MetaDataDictionary
				.getInstance( )
				.getElement( ReportDesignConstants.STYLE_ELEMENT ) );
	}
	/**
	 * Finds a named report item in this module and the included modules. This
	 * is for body elements in the element's name space.
	 * 
	 * @param name
	 *            The name of the element to find.
	 * @return The element, or null if the element is not found.
	 */
	public DesignElement findElement( String name )
	{
		return resolveNativeElement( name, ELEMENT_NAME_SPACE );
	}
	/**
	 * Finds a data source by name in this module and the included modules.
	 * 
	 * @param name