Reviewed-by: alanb

Summary: The [GetEffectiveRightsFromAcl] based implementation was changed to the [AccessCheck] based.
Reviewed-by: alanb

Reviewed-by: dholmes

Reviewed-by: ohair, chegar, mchung

Reviewed-by: chegar

Reviewed-by: darcy, weijun

Reviewed-by: sherman

6844313: New I/O: File timestamps should be represented by a FileTime rather than a long+TimeUnit
Reviewed-by: sherman

6808647: (file) Paths.get("C:").newDirectoryStream() iterates over Path elements with additional slash [win]
6808648: (file) Files.walkFileTree should obtain file attributes during iteration [win]
Reviewed-by: sherman

4313887: New I/O: Improved filesystem interface
4607272: New I/O: Support asynchronous I/O
Reviewed-by: sherman, chegar