bu_humanize_number is derived from FreeBSD's libutil implementation of
humanize_number.c, v 1.14 2008/04/28

Copyright (c) 1997, 1998, 1999, 2002 The NetBSD Foundation, Inc.
Copyright 2013 John-Mark Gurney <jmg@FreeBSD.org>
All rights reserved.

This code is derived from software contributed to The NetBSD Foundation
by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
NASA Ames Research Center, by Luke Mewburn and by Tomas Svensson.

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