SYMBOL-VALUE and (SETF SYMBOL-VALUE) should move

[robert-strandh]

Currently, the functions SYMBOL-VALUE and (SETF SYMBOL-VALUE) are defined in the module SICL-HIR-EVALUATOR. They are defined to take an environment object and a symbol as arguments. Instead, there should be functions in the SICL-RUN-TIME module called SYMBOL-VALUE and (SETF SYMBOL-VALUE) that take a symbol name, the dynamic environment, and the global value cell as arguments. That cell contains the unbound value in its CDR.

Similarly, BOUNDP and MAKUNBOUND should be defined in the SICL-RUN-TIME module and take the same kind of arguments.