* Methods.cs: Get the method namespace from the binding, not from the web

	* Methods.cs: Get the method namespace from the binding, not from the web
	service.
	* TypeStubManager.cs: When adding a binding, ignore it if it has already
	been added. Changed WebServiceLiteralNamespace by the method
	GetWebServiceLiteralNamespace. The literal namespace depends on the binding
	namespace, so it has to be provided as parameter.
	* XmlReturnReader.cs, XmlReturnWriter.cs: Use GetWebServiceLiteralNamespace
	instead of WebServiceLiteralNamespace.

svn path=/trunk/mcs/; revision=22273