removed unused NamedList

args and locals got inlined into message, forgot to delete then
ripples out due to type creation
small type class api change, more ripples, but also more consistent

lib/parfait/type.rb

@@ -42,12 +42,19 @@ module Parfait
       5
     end
 
-    def self.for_hash( object_class , hash)
+    def self.for_hash( hash , object_class = :Object)
+      name = object_class
+      if(object_class.is_a?(Symbol))
+        object_class = Parfait.object_space.get_class_by_name(object_class)
+      end
+      raise "No such class #{name}" unless object_class
       hash = {type: object_class.name }.merge(hash) unless hash[:type]
       new_type = Type.new( object_class , hash)
       Parfait.object_space.add_type(new_type)
     end
 
+    # should not be called directly. Use Type.for_hash instead, that adds the
+    # type to the global list
     def initialize( object_class , hash )
       super()
       set_object_class( object_class)
@@ -185,7 +192,7 @@ module Parfait
       raise "No nil type" unless type
       hash = to_hash
       hash[name] = type
-      return Type.for_hash( object_class , hash)
+      return Type.for_hash( hash , object_class)
     end
 
     def set_object_class(oc)