- Copy stable/10@285827 to releng/10.2 in preparation for 10.2-RC1
builds.
- Update newvers.sh to reflect RC1.
- Update __FreeBSD_version to reflect 10.2.
- Update default pkg(8) configuration to use the quarterly branch.[1]

Discussed with: re, portmgr [1]
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

Sync with OpenBSD, primarily make the code easier to read, and a license
change to standard OpenBSD ISC license.

Obtained from: OpenBSD
MFC after: 2 weeks

Add basename_r(3) to complement basename(3). basename_r(3) which accepts
a caller-allocated buffer of at least MAXPATHLEN, rather than using a
global buffer.

MFC after: 1 month
Sponsored by: Google

More accurately document the implementation details of internal storage.

PR: docs/82508

Mechanically kill hard sentence breaks.

mdoc(7) police: Fixed abuses of the .Ar and .Em macros.

mdoc(7) police: "The .Fn function".

mdoc(7) police: Use the new .In macro for #include statements.

Give the FreeBSD history also.

mdoc(7) police: use certified section headers wherever possible.

Import XPG4-compliant basename(3) and dirname(3) from OpenBSD.
The man pages need some adjustments.

PR: 12960, 12962
Submitted by: James Howard <howardjp@wam.umd.edu>
Obtained from: OpenBSD