Initialize language->quirks to NULL

This was a clear oversight.  I caught it by running valgrind, which I
now realize I should try to do more often...
Test pconfigure with valgrind

I figure because valgrind caught that last bug that it would be good
to test using it regularly.  This runs every pconfigure test (all the
binaries) under valgrind (and then under non valgrind, just in case).
Add a sleep in test/pconfigure/harness.bash

I think the problem here is that my system's time resolution isn't
good enough and I end up missing a dependency.  This only happens on
palmer-desktop (which is really out of date, and also runs tmpfs), and
when I manually look at the generate makefile it seems correct.

Adding this one second sleep ensures that we wait for a system timer
tick (in reality, many of them) between the file modifications, which
makes this work.