Make sure the changelog mentions files whose flags changed These changes don't actually need a new filelog entry (see next patch), but if we don't mention the files in the changelog, it becomes much harder to find all changesets that touch a file (not even a "hg log --removed file" will work).

# should print nothing
# should print ? b/x
? b/x
# should print A b/x
A b/x
# should forget b/x
forgetting b/x
# should print nothing