No need for a special idle queue

- as the idle task is never placed on any run queue, we don't need any special
  idle queue.

- one more queue available for user processes

kernel/proc.h

@@ -223,9 +223,10 @@ struct proc {
 #define NR_SCHED_QUEUES   16	/* MUST equal minimum priority + 1 */
 #define TASK_Q		   0	/* highest, used for kernel tasks */
 #define MAX_USER_Q  	   0    /* highest priority for user processes */   
-#define USER_Q  	   7    /* default (should correspond to nice 0) */   
-#define MIN_USER_Q	  14	/* minimum priority for user processes */
-#define IDLE_Q		  15    /* lowest, only IDLE process goes here */
+#define USER_Q  	  (NR_SCHED_QUEUES / 2) /* default (should correspond to
+						   nice 0) */
+#define MIN_USER_Q	  (NR_SCHED_QUEUES - 1)	/* minimum priority for user
+						   processes */
 
 /* Magic process table addresses. */
 #define BEG_PROC_ADDR (&proc[0])