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mutmut show: display status
mutmut show X should also display the status of the mutant.
This should be done in a way to have the output still be a valid patch, but that means to just prepend it at the top, maybe à la "# mutant status: …".
This is related to #105 a bit.
Maybe just print out a warning if you show a non-surviving mutant? Since you're probably making a mistake at that point.