ui: add 'force' parameter to traceback() to override the current print setting
This will allow a current traceback.print_exc() call in dispatch to be replaced
with ui.traceback() even if --traceback was not given on the command line.
To run the tests, do:
cd tests/
python run-tests.py
See http://mercurial.selenic.com/wiki/WritingTests for
more information on writing tests.