Fix new tests to be better. In particular, fix webraw test to specify a date on commit to be less brittle, and fix test-oldcgi to test fetching a subdirectory of a webdir instance.

#!/bin/sh

hg init
python -c 'print "confuse str.splitlines\nembedded\rnewline"' > a
hg ci -Ama -d '1 0'
echo clean diff >> a
hg ci -mb -d '2 0'
hg diff -r0 -r1