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'
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abort: impossible time zone offset: 4444444
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abort: invalid date: '1\t15.1'
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abort: invalid date: 'foo bar'
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abort: invalid date: ' 1 4444'
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abort: date exceeds 32 bits: 111111111111
abort: No such file or directory: .../test/bar