Spec changes

• Change this:

  "Some server platforms may provide access control functionality that goes beyond the UNIX-style mode attribute, but which is not as rich as the NFS ACL model. So that users can take advantage of this more limited functionality, the server may indicate that it supports ACLs as long as it follows the guidelines for mapping between its ACL model and the NFS version 4 ACL model."

  To this:

  "The NFS version 4 ACL model is quite rich. Some server platforms may provide access control functionality that goes beyond the UNIX-style mode attribute, but which is not as rich as the NFS ACL model. So that users can take advantage of this more limited functionality, the server may support the acl attribute by mapping between its ACL model and the NFS version 4 ACL model. Such servers SHOULD nevertheless accept any NFSv4 ACL, and ensure that the ACL they actually store or enforce is at least as strict as the NFSv4 ACL that was set."

• Updated draft-ietf-nfsv4-acl-mapping: now implementation advice and experience rather than POSIX-over-NFSv4 protocol.

• Allow more informative server error-reporting?
• Allow less strict ACL enforcement?
• Document Windows ACL editor conventions?
• More testing.