work towards a clean compile on migrating set and get variables from Tag.

Operand.h

@@ -2,6 +2,7 @@
 #define __Operand_h__
 
 #include "MString.h"
+#include "Tag.h"
 #include "Global.h"
 
 namespace jet {
@@ -9,10 +10,7 @@ namespace jet {
    class Operand {
 
     public:
-      Operand(coreutils::ZString &in,
-	      Global &global,
-	      std::map<coreutils::MString, coreutils::MString> &lvariables,
-	      std::map<coreutils::MString, coreutils::MString> &keywords);
+      Operand(coreutils::ZString &in, Tag &tag);
 
       bool isNumber;