OPerand now does its own expression parsing.

Operand.h

@@ -2,13 +2,14 @@
 #define __Operand_h__
 
 #include "MString.h"
+#include "Global.h"
 
 namespace jet {
 
    class Operand {
 
     public:
-      Operand(coreutils::ZString &in);
+      Operand(coreutils::ZString &in, Global &global, std::map<coreutils::ZString, coreutils::MString> &lvariables);
 
       bool isNumber;