Helpful message when path not found

[jtlapp]

This is a PR for issue #759. Also appended LFs to error messages that cli.js outputs to options.output so that the shell prompt lands on the following line.

[jtlapp]

A decision still needs to be made about the appropriate exit code. If it should be zero, then the reporter test case cited in #759 will fail (and apparently for the wrong reasons).

[jtlapp]

An alternative solution would pull the missing file name out of the error message, so that lab would properly report files in subdirectories that get deleted in the middle of a test run (under very specific circumstances). I was less comfortable with creating a dependency on the form of the error message. The only other option adds complexity to the traverse() function.

The present implementation seemed like a reasonable compromise of probability and simplicity.

[jtlapp]

Hold on. I thought of a simple fix that shows even files deleted mid-test. Mod coming...

[jtlapp]

That should do it.

[geek]

@jtlapp thanks, this will be included in the next release.

[lock]

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