Instance variable work.

include/decl.h

@@ -460,6 +460,11 @@ struct instance_variables {
     boolean m_using; /* kludge to use mondided instead of killed */
     /* pickup.c */
     int oldcap; /* last encumberance */
+    /* save.c */
+    boolean havestate;
+    unsigned ustuck_id; /* need to preserve during save */
+    unsigned usteed_id; /* need to preserve during save */
+
     /* trap.c */
     int force_mintrap; /* mintrap() should take a flags argument, but for time
                           being we use this */