Copyright (c) Xoetrope Ltd., 2001-2006, This software is licensed under
the GNU Public License (GPL), please see license.txt for more details. If
you make commercial use of this software you must purchase a commercial
license from Xoetrope.
Creates a new instance of SvgLayer
Parameters: name - String specifying the name to be given to the layer. Parameters: imageMap - XSvgImageMap instance that will contain the new layer.