the acronym.

rather than just complaining about stderr not being what we expected masking
the true problem.

Fix segfault discovered by Ron Adam.  Not checking for terminating right bracket in "'{0[}'.format(())".  Fixed, and tests added.

Removed used_args param from string.Formatter.get_field.  It was left in by mistake from an earlier edit.

Partial py3k-ification of Doc/library/: convert has_key references into either 'k in d' or __contains__; normalize raise statements; convert print statements into print function calls.