the project root directory, which is still to be fixed; and *I think* known-failing
tests which I don't intend to fix immediately should be marked in some way.
Results are quite disappointing. Resolution on long doubles is nothing like as good as I hoped; they're out by one part in 10^20.
All unit tests except one pass, and the one that doesn't is a very minor rounding issue, so I'm calling it good.