Implemented ImageZigzagPersistence * Changed ZigzagPersistence to support a visitor, and implemented ImageZigzagPersistence * examples/rips/rips-zigzag now computes using ImageZigzagPersistence * PersistenceDiagram no longer records zero persistence pairs * Added utilities/memory.h with report_memory() function

#ifndef __PYTHON_STATIC_PERSISTENCE_H__
#define __PYTHON_STATIC_PERSISTENCE_H__

#include <topology/static-persistence.h>

typedef         StaticPersistence<>             SPersistence;
typedef         SPersistence::OrderElement      SPersistenceNode;

#endif