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Hint about pytest-xdist was removed because it did not work anyway.
For some reason py.test without xdist returns exit code 2 which is the
same as for premature test interruption.

Supposedly Mac OS's readlink does not have -f argument and this broke
all scripts using it. After all it seems unnecessary, so I just removed
it. Let's see what will break.

Failing early is especially important in scripts which run make multiple
times. It prevents the user from missing some failing tests in earlier
runs.

This is useful for other testing tools which can place binaries in weird
locations etc.