. load average calculation changed to calculate it all over every tick

instead of keeping a running total of enqueued processes
   (because somehow the load average was broken)
 . added SI_KPROC_TAB to get a copy of kernel process table from PM, for
   a top implementation
 . fixed arg to sys_nice() to make it an endpoint, not a slot number

kernel/main.c

@@ -145,9 +145,6 @@ PUBLIC void main()
 	alloc_segments(rp);
   }
 
-  /* Special compensation for IDLE - don't let it count in the load average. */
-  kloadinfo.procs_enqueued--;
-
 #if ENABLE_BOOTDEV 
   /* Expect an image of the boot device to be loaded into memory as well. 
    * The boot device is the last module that is loaded into memory, and,