make check: eliminate carry-over from ancient tests

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I've changed functions.sh to delete a subdirectory of
testing/*/results just before running the test that will repopulate
it.

I did this after being confused for a long time by results left over
from ancient tests.

The result seems to work, but be warned: I didn't completely
understand what I was changing.

Hugh Redelmeier
[email protected]  voice: +1 416 482-8253

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