From 9e8120520cc801f74cbda1f8dba2370fa873b4f8 Mon Sep 17 00:00:00 2001
From: Guilhem Lavaux <guilhem.lavaux@gmail.com>
Date: Wed, 6 Jul 2011 11:35:17 -0400
Subject: [PATCH] Added support for single depth in drawVoids, optionally
 extract zobov particles in stackVoidsZero