Implement Python Database API Specification v2.0 Two-Phase Commit Extensions

[mariuz]

Philippe Makowski requested one more thing on todo list :
implement Python Database API Specification v2.0 Two-Phase Commit Extensions
see http://www.python.org/dev/peps/pep-0249/

http://article.gmane.org/gmane.comp.db.firebird.python/75/