* we don't need RADMIN_OUTPUT_DIR, we can just use OUTOUT
* it's better to use ".txt" for text files, even if they are
* similar ".out" instead of ".ret". They're still text, but
we care more to know that they're outputs
* test files don't need numbers. If the tests are ordered,
we should put that information into the tests instead of
in the names
* test files don't need to be in a subdirectory.