- Fixed comments in various system call handlers. Work in progress on new

sys_privctl() call to dynamically start servers and drivers.

- Shutdown sequence slightly adjusted: called as watchdog timer to let the
  busy sys_abort() call from the PM return first.

- Changed umap_bios() to have more restrictive check: BIOS memory is now
  allowed in BIOS_MEM_BEGIN to END (interrupt vectors) and BASE_MEM_TOP
  to UPPER_MEM_END. Hopefully this keeps QEMU and Bochs happy.

kernel/proc.c

@@ -308,6 +308,7 @@ unsigned flags;				/* system call flags */
             return(OK);					/* report success */
         }
 
+#if TEMP_CODE
         ntf_q_pp = &caller_ptr->p_ntf_q;	/* get pointer pointer */
         while (*ntf_q_pp != NULL) {
             if (src == ANY || src == (*ntf_q_pp)->n_source) {
@@ -328,6 +329,7 @@ unsigned flags;				/* system call flags */
 	    ntf_q_pp = &(*ntf_q_pp)->n_next;	/* proceed to next */
         }
     }
+#endif
 
     /* Check caller queue. Use pointer pointers to keep code simple. */
     xpp = &caller_ptr->p_caller_q;