Modified Files:
   	basesrc/usr.bin/systat: Makefile cmdtab.c extern.h keyboard.c systat.1
   Added Files:
   	basesrc/usr.bin/systat: bufcache.c
   
   Log Message:
   - Add `bufcache' display which shows buffer cache usage per filesystem,
     ala the monitor(1) command for Ultrix.
   - Allow `h' or `?' to show the command list (same as `:help').
   - Sort commands in cmdtab.c and systat.1


this *rules*