Revert "Renamed instance_variables to global_variables and iv to g."

This reverts commit f9a0db6c44.

sys/share/pcmain.c

@@ -97,7 +97,7 @@ char *argv[];
 
     nethack_enter(argc, argv);
 
-    instance_globals_init();
+    instance_variable_init();
     sys_early_init();
 
 #if defined(WIN32) && defined(TTY_GRAPHICS)

sys/share/random.c

@@ -238,7 +238,7 @@ unsigned x;
 char *
 initstate(seed, arg_state, n)
 
-unsigned seed;   /* seed for RNG */
+unsigned seed;   /* seed for R. N. G. */
 char *arg_state; /* pointer to state array */
 int n;           /* # bytes of state info */
 {