wrap testers in top level testset

[oxinabox]

example output

julia> test_rrule(two2three, 3.33, -7.77)
Test Summary:                          | Pass  Total
test_rrule: two2three at (3.33, -7.77) |    6      6
Test.DefaultTestSet("test_rrule: two2three at (3.33, -7.77)", Any[Test.DefaultTestSet("Don't thunk only non_zero argument", Any[], 0, false)], 6, false)

Closes #121 and #108

I recomment turning on "hide whitespace changes" when reviewing,
since this indented a ton of code without changing it

---

[oxinabox]

oh boy this breaks a lot of our unhappy path tests

[oxinabox]

Ok, most of this PR is now improving out meta-testing ability

[oxinabox]

Suggested change

# Error occurs. Takes no action in the event of a Pass or Broken result

[nickrobinson251]

LGTM

As far as i understand this implements a AbstractTestSet as intended, and this seems a nice useage

[oxinabox]

As far as i understand this implements a AbstractTestSet as intended, and this seems a nice useage

Yeah, i think this is much nicer than before. And I couldn'tt workout how to handle errors the otherway.
A benifit i didn't realize of doing it this way is that we don't need to mute anymore.
Because the printlns I was hiding were all actually triggered by record
being unmuted means i can insert println debugging messages.