Added rips-zigzag; in the process caught a number of bugs in ZigzagPersistence (added check_consistency() to it)
#ifndef __PYTHON_STATIC_PERSISTENCE_H__
#define __PYTHON_STATIC_PERSISTENCE_H__
#include <topology/static-persistence.h>
typedef StaticPersistence<> SPersistence;
typedef SPersistence::OrderElement SPersistenceNode;
#endif