dirstate: don't walk ignored directories With a pattern like '^directory$' in .hgignore, a "hg status directory" would still walk "directory" and all its subdirs. This is the first half of a fix for issue886.

revert: don't assume ignored files will be returned in the unknown list That's just an artifact of the current implementation, and I'll change that soon. Bonus points: - we don't care about the unknown list at all - we don't print an extra message if we try to revert a removed file that is not present in the target revision