pub/t/x*: Rearrange the Monte-Carlo tests.
* Insert more intermediate values, specifically at every power of 10.
* Rather than calculating the whole thing from scratch each time,
tests other than the first one continue from the previous
state (which I had to calculate the hard way and enter into the
test-vector files). The total iteration count and final results
still match the RFC.
* Split the very slow high-iteration-count tests into a separate file,
where they can be run discretionally without having to edit source
files. Arrange to distribute these new files.
~mdw / catacomb / commit