make binary code indexed (not derive from word)

still some work to be done there, as we should really have a byte buffer

lib/parfait/binary_code.rb

@@ -9,18 +9,17 @@
 module Parfait
   # obviously not a "Word" but a ByteArray , but no such class yet
   # As on the other hand has no encoding (yet) it is close enough
-  class BinaryCode < Word
-    def initialize name
-      super(0)
-      self.name = name
-    end
+  class BinaryCode < Object
     attribute :name
 
-    # this is a sof check if there are instance variables or "structure"
-    # have to override false, as word answers true
-    def is_value?
-      false
+    include Indexed
+    self.offset(2)
+
+    def initialize name
+      super()
+      self.name = name
     end
+
     def to_s
       "BinaryCode #{self.name}"
     end