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'
port:4:export
port:4:vaportight
port:4:import/export
FIXME: history is wrong here
port:1:1:-:eggs:import
port:1:2:+:eggs:vaportight
port:1:3:+:eggs:import/export
port:0:2:+:spam:export
port:0:1:+:spam:import
port:4:import/export