let spce keep the messages in a factory #14

Like Integers and addresses before, messages are now in a factory
Factories keep allocated (uninitialised) objects, had to make init public to call it

test/parfait/type/test_basic.rb

@@ -5,7 +5,7 @@ module Parfait
 
     def setup
       super
-      @mess = @space.next_message
+      @mess = @space.get_next_for(:Message)
       assert @mess
       @type = @mess.get_type()
     end

test/parfait/type/test_message.rb

@@ -5,7 +5,7 @@ module Parfait
 
     def setup
       super
-      @mess = @space.next_message
+      @mess = @space.get_next_for(:Message)
     end
 
     def test_message_type

test/parfait/type/test_type_api.rb

@@ -27,7 +27,7 @@ module Parfait
       assert_equal Parfait::Space , space.class
       type = space.get_type
       assert_equal Parfait::Type , type.class
-      assert_equal 9 , type.names.get_length
+      assert_equal 7 , type.names.get_length
       assert_equal type.object_class.class , Parfait::Class
       assert_equal type.object_class.name , :Space
     end