* HttpGetTypeStubInfo.cs, HttpPostTypeStubInfo.cs, HttpSimpleTypeStubInfo.cs,

	* HttpGetTypeStubInfo.cs, HttpPostTypeStubInfo.cs, HttpSimpleTypeStubInfo.cs,
	  HttpSoapWebServiceHandler.cs, Methods.cs, SoapHttpClientProtocol.cs,
	  TypeStubManager.cs
	  Added class LogicalTypeInfo, which contains info common to all protocols
	  through which a web service can be accessed. Also, modified the way
	  Serializers are created. Instead of creating one by one, they are now
	  created all at once. This will make serialization creation more efficient
	  when the serializer code generator is in place.
	* SoapRpcMethodAttribute.cs: Set the correct default values for the
	  properties.
	* WebServiceHelper.cs: Removed unused method GetServiceNamespace().
	* XmlReturnReader.cs, XmlReturnWriter.cs: Get the namespace for the return
	  type from LogicalTypeInfo.

svn path=/trunk/mcs/; revision=19013