fix locate broken since 63799b01985c - fix the keyword arguments for walk in commands.locate - implement 'hg locate -r <rev>' - add a test for 'hg locate'

#!/bin/sh

mkdir t
cd t
hg init
echo a > a
hg add a
hg commit -m "test" -d "0 0"
hg verify
hg parents
hg status
hg undo
hg verify
hg parents
hg status