map-partition takes an input map and generates a set of sub-maps using
recursive spectral bisection with a threshold of 1 (default), or the one passed
as second argument.
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 3, or (at your option) any
later version.
On Debian GNU/Linux systems, the complete text of the GNU General
Public License can be found in `/usr/share/common-licenses/GPL'.