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
{
		URL url = getSession( ).getResourceLocator( ).findResource(
				(ModuleHandle) getHandle( this ), fileName, fileType );
		return url;
	}
	/**
	 * Loads library with the given library file name. This file name can be
	 * absolute or relative. If the library doesn't exist or fatal error occurs
	 * when opening library, one invalid library will be added into the library
	 * list of this module.
	 * 
	 * @param libraryFileName
	 *            library file name
	 * @param namespace
	 *            library namespace
	 * @return the loaded library
	 * @throws DesignFileException
	 *             if the library file has fatal error.
	 */
	public Library loadLibrary( String libraryFileName, String namespace )
			throws DesignFileException
	{
		if ( libraries == null )
			libraries = new ArrayList( );
		URL url = findResource( libraryFileName, IResourceLocator.LIBRARY );
		if ( url == null )
		{
			DesignParserException ex = new DesignParserException(
					new String[]{libraryFileName},
					DesignParserException.DESIGN_EXCEPTION_FILE_NOT_FOUND );