use cattr instead of metaclass

so we can catch it in the compiler, like also attr
define cattr in adapter, no change in tests !

lib/parfait/factory.rb

@@ -16,7 +16,7 @@
 
     @page_size = 1024
     @reserve_size = 10
-    class << self; attr_accessor :page_size ; attr :reserve_size end
+    cattr :page_size , :reserve_size
 
     # initialize for a given type (for_type). The attribute that is used to create the
     # list is the first that starts with next_ . "next" itself would have been nice and general

lib/risc/parfait_adapter.rb

@@ -54,6 +54,14 @@ module Parfait
         @memory._set(index , value)
       end
     end
+
+    def self.cattr( *names )
+      names.each do |ca|
+        class_eval "@@#{ca} = 0"
+        class_eval "def self.#{ca}; return @#{ca};end"
+        class_eval "def self.#{ca}=(val); @#{ca} = val;end"
+      end
+    end
   end
 
   # new list from ruby array to be precise