Commit before merging in Python branch: * converted more examples: poincare, rips, some fitness * two generators for Rips complexes * ChainWrapper uses stl algorithms for everything, added CountingBackInserter and switched SizeStorage to use operators * retabbing files along the way * added #957a (namespace dionysus)

From: Dmitriy Morozov <morozov@cs.duke.edu>
Date: Fri, 22 Feb 2008 18:39:31 -0500
State: new
Subject: Incorrect sign_at() in UPolynomial<double>
Message-Id: <cd79223a108d3900-0-artemis@metatron>

UPolynomial<double>::sign_at() reports -1 as the sign of -2*x + 4 at x = 2. 
Should be 0.