manifest: use match.prefix() instead of 'not match.anypats()' It seems clearer to check for what it is than what it isn't.

dirstate: use match.prefix() instead of 'not match.anypats()' It seems clearer to check for what it is than what it isn't.

commit: avoid match.files() in conditions See 9789b4a7c595 (match: introduce boolean prefix() method, 2014-10-28) for reasons to avoid match.files() in conditions.