dirstate: add __contains__ and make __getitem__ more useful
dirstate.state(f) == '?' -> f not in dirstate
dirstate.state(f) -> dirstate[f]
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1 files updated, 0 files merged, 0 files removed, 0 files unresolved
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
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