Add a --failfast option to stop testing after the first failure #2290
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Whilst misleading if run from Jenkins or from a general regression point of
view (where knowing about all failures is invariably more useful), bailing
out on the first failure is more appropriate behaviour in a "REPL", TDD or
simply a quick "hack it until the tests pass" mode of coding.
Signed-off-by: Chris Lamb chris@chris-lamb.co.uk