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

__system.cpp

@@ -8,7 +8,7 @@
 
 namespace jet {
    
-   __system::__system(coreutils::ZString &in, coreutils::MString &out, Global &global) : Tag(in, out, global) {
+   __system::__system(coreutils::ZString &in, coreutils::MString &parentOut, Global &global, Tag *parent) : Tag(in, parentOut, global, parent) {
       if(hasContainer)
 	throw coreutils::Exception("system tag cannot have a container.");	
       if(!variableDefined(coreutils::ZString("pgm")))