remove all that label stuff

left over after rewrite from blocks to linked list

lib/common/list.rb

@@ -50,11 +50,16 @@ module Common
     end
     alias :<< :append
 
-    def length( labels = [] )
-      ret = 1
-      ret += self.next.length( labels ) if self.next
+    def length
+      ret = 0
+      self.each { ret += 1}
       ret
     end
 
+    def each(&block)
+      block.call(self)
+      @next.each(&block) if @next
+    end
+
   end
 end