mochajs / mocha / 5527

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fix --inspect and its ilk; closes #3681

- upgrade `node-environment-flags`
- add some tests
- use `mocha:cli:mocha` in `bin/mocha` as unique `DEBUG` identifier (`DEBUG=mocha:cli:mocha bin/mocha ...`)
- add some handiness to the integration test helpers
- update docstrings in integration test helpers

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