Add linting information and test failures to html

[Marsup]

First, sorry for the massive refactor ;)

This patch :

1. adds tooltips on most elements of the page (Document html coverage report source markup #439)
2. adds margin marks in the coverage section about linting errors
3. repeats those linting errors at the bottom of the report in case coverage is not enabled
4. adds a list of test script errors at the bottom of test errors

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[2]

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[geek]

@Marsup you are on a roll... thank you!

[Marsup]

Consequences of giving a nodejs training last week and seeing trainees lost as to why the tests failed while the report shown nothing ;)

[skeggse]

Marvelous, thanks!

[lock]

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