Added code to expose the persistence_diagram class, the bottleneck_distance function and the point class to python. Most of the commonly used methods for each class have been exported. The constructor for point now requires that a data argument be provided along with x and y coord. This needs to be made optional. The constructor for persistence_diagram could possibly be rewritten as well.

From: Dmitriy Morozov <morozov@cs.duke.edu>
Date: Wed, 27 Feb 2008 16:30:57 -0500
State: fixed
Subject: Segfault with topology/vineyard log enabled
Message-Id: <d2ab07329c3588ca-0-artemis@metatron>

The code segfaults in Vineyard::record_knee() if we subscribe to
topology/vineyard log.