tests/test-notfound

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

#!/bin/sh

hg init

echo "Is there an error message when trying to diff non-existing files?"
hg diff not found

echo "Is there an error message when trying to add non-existing files?"
hg add not found