small fixes for test-newbranch - hg tip doesn't use the branch cache; use hg log -r in its place - commit doesn't use a HG_MERGE environment variable - change the dates from "0 0" to "1000000 0"

#!/bin/sh

hg init
echo This is file a1 > a
hg add a
hg commit -m "commit #0" -d "1000000 0"
touch b
hg add b
rm b
hg commit -A -m"comment #1" -d "1000000 0"