Bug 257267: allow trimming leading zeros when typing the test number in the testing suite; patch by GavinS <bugzilla@chimpychompy.org>; r=vladd, a=myk.

r=justdave
a=justdave

runtests.pl now lets you specify a test number on the command line if you only want to run that specific test instead of all of them. (no bug number)

while in order to allow tinderboxen to transition and any documents to be
updated.

Patch by Norton <norton@w5ac.tamu.edu>, r1=jouni, r2=gerv