convert: clear the dirstate before a conversion, invalidate it afterwards Clearing it before the conversion protects us from whatever data were there (file copies in particular). Invalidating it after the conversion avoids writing a possibly inconsistent dirstate to disk.

convert: avoid dirstate checks; add a test During a conversion, the dirstate contents are not consistent - there are files that may be missing from the dirstate and there may be files that shouldn't be in the dirstate. While this is not fixed, don't mark files as added - put them directly in state 'n'ormal.

merge with crew