Improve surfacing test failures

[mfridman]

Sometimes you want to see just the failed test names. By default tparse prints package/test and the corresponding failure output, but these can add up.

Not sure how to solve this, maybe a -fail-name-only flag or -disable-failure-output or -include-failures-in-test-table, to effectively show the names of the failed tests. (these are contrived flag names, they would normally be shorter).

The go test output for a large suite prints this sort of thing, and what I want is to hide the --- PASS and only see the --- FAIL lines, tparse should help me here.

--- FAIL: "***********************"
    --- PASS: 
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    --- FAIL: "***********************"
        --- PASS: 
        --- FAIL: "***********************"
            --- FAIL: "***********************"
            --- FAIL: "***********************"
            --- PASS: 
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FAIL