Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Switch to our preferred license text.

Approved by: jedgar

Fix breakage introduced in last commit.

Improve ACL branding mismatch detection and reporting in some rare cases,
such as "setfacl -m ''".

/*- or .\"- or #- to begin license clauses.

Consistently use FBSDID

style(9) cleanups mostly consisting of:
o explicitly check return values and variables against a value
o return x; -> return (x);
o fix inconsistent sysexits usage by nuking it (partially
suggested by bde)

Obtained from: TrustedBSD Project

o Correct error message forgotten in the last commit (malloc() -> calloc())
o Fix style nits

Submitted by: bde

Use calloc(3) instead of rolling our own.

o POSIX.2c Userland tool support for POSIX.1e ACLs -- getfacl retrieves ACLs
from files and directories, and setfacl sets ACLs on files and directories.

Submitted by: jedgar
Obtained from: TrustedBSD Project