tests: don't let time go back before 0 o'clock in bisect3.t
Windows agree that it was
Thu Jan 01 00:00:00 1970 +0000
but it also claims that it was
Thu Dec 31 23:59:59 1969 -0000
tests: make '(esc)' matching in run-tests.py work as intended
The code for match on (esc) lines didn't work, and it would thus always end up
emitting another suggestion ... which however would match the old one.