We found out with Jane @jtournois that a testsuite with VLD was a lot
slower than the same testsuite without it. That can explain why picasso
can no longer process 7 or 8 testsuites per day, but only barely 3 or 4.
Picasso will no longer use VLD, and Jane's machine, Sosno, will use it
only once per week, on Saturdays.