Remove weird implementation of --show_traceback and --pdb. #2216
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Also set options.show_traceback in all test modules I could find.
These flags used to be implemented as globals in errors.py that had to
be set by calling set_show_tb() or set_drop_into_pdb() (and setting
the corresponding Options attributes had no effect). Now they're just
regular options. I had to adjust some plumbing to give
report_internal_error() access to the options but it was easier than I
thought.