Fix file-changed-to-dir and dir-to-file commits (issue660). Allow adding to dirstate files that clash with previously existing but marked for removal. Protect from reintroducing clashes by revert. This change doesn't address related issues with update. Current workaround is to do "clean" update by manually removing conflicting files/dirs from working directory.

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To run the tests, do:

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cd tests/

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python run-tests.py

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See http://www.selenic.com/mercurial/wiki/index.cgi/WritingTests for

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more information on writing tests.