Indicate if there's suppressed terminal output in verbose mode

[jimporter]

(Spun out from #33)

Right now, there's no indication that terminal output has been suppressed. This is sad. There should at least be something in verbose mode, since it has all the other details of each test. Something like this would probably be good:

my test that prints to stdout PASSED [stdout]
my test that prints to stderr PASSED [stderr]
my test that prints to both PASSED [stdout+err]