Added command stack wrappers and fixed up nread and removed dead code from nserver

Removed direct access from token.c

token.c

@@ -94,11 +94,11 @@ int TokenWrapper(SConnection * pCon, SicsInterp * pSics, void *pData,
     /* we can do it */
     iToken = 1;
     TaskSignal(pServ->pTasker, TOKENGRAB, NULL);
-    pCon->iGrab = 0;            /* to enable us to do commands */
+    SCSetGrab(pCon,0);            /* to enable us to do commands */
     SCSendOK(pCon);
     return 1;
   } else if (strcmp(argv[1], "release") == 0) {
-    if (pCon->iGrab != 0) {
+    if (SCGetGrab(pCon) != 0) {
       SCWrite(pCon,
               "ERROR: you cannot release somebody elses control token!",
               eError);