Added parent tag pointer throughout call hierarchy.Cleaned up output hierarchy parameter names.

__read.h

@@ -8,7 +8,7 @@ namespace jet {
    class __read : public Tag {
    
     public:
-      __read(coreutils::ZString &in, coreutils::MString &parent, Global &global);
+      __read(coreutils::ZString &in, coreutils::MString &parentOut, Global &global, Tag *parent);
 
     private:
       int fd;