First pass at updating top(1):

First pass at updating top(1):

	* add command line option '-T' for displaying kernel threads
	  such as pagedaemon, tcp_thread, and so on; the threads are
	  now marked '<thread>' in the top(1) display.

	* cleanup manipulation of COMMAND strings, insipired by a
	  similar change in NetBSD's top(1).

	* add a toggle for system processes, called 'S' so we dont
	  need to restart top(1) to {un}display system processes.

	* change some sprintf's to snprintfs for safety.

	* update the sort/ordering top(1) commands so that it correctly
	  displays kernel threads by priority time used etc.

	* add a 'thr' sort order function so that kernel threads can be
	  collected together in the top(1) display; this is useful when
	  running it in batch mode.

	* fix the screen width issue for terminals that have more than
	  80 columns; this was necessary for showing threads properly in
	  SMP mode.

	* add ability for top(1) to sort kernel threads their priority
	  (note, thread priorities are stored differently).

NOTE! top(1) is now using the contrib-patching framework just like
we do with GCC-3 so that it will be simple to update the base code
in the future if required.

CREDITS
Thanks go to Matthew Dillon <dillon@backplane.com> for reviewing the
patches and supplying me with an SMP machine to test the changes.