Made the data argument in Point's __init__method to be an optional argument by making it a boost::python::optional.
From: Dmitriy Morozov <dmitriy@mrzv.org>
Date: Fri, 10 Apr 2009 14:33:18
State: new
Subject: Intrusive containers for ZigzagPersistence
Message-Id: <e6f52c44ef26f4a7-0-artemis@cole>
category: efficiency
Use Boost's intrusive containers to store rows in ZigzagPersistence. This
should get rid of the inefficiencies associated with the simplex removal
(through ZigzagPersistence::remove()).