backport to v2.7, fixes #28, fixes winks

Explicitly defined new-style classes for Python 2.7 to correct issues
with properties.
Narrow down crash

The traceback shows an IndexError when popping a confirmed card from the
hand.  The play was the last four cards of the hand, on round 20,
including a special and a flush, by tapping... but none of that seems
reproducible.