- 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

Garbage collect man page reference to IFF_NEEDSGIANT.

Add a minimal altq.4 manpage to tell about the kernel options and where to
find more information. Also move the "SUPPORTED DEVICES" section from altq.9
to altq.4, where is belongs.

Requested by: green
MFC after: 2 days

dc(4) is now supported as well. While here sort the list and remove awi,
which isn't yet supported.

Document supported devices here (for lack of a better place). Users
interested in ALTQ are likely to type in "man altq" at some point and maybe
they will scroll down to the bottom as well.

MFC after: 3 days

mdoc(7) and english grammar makeover.

Submitted by: ru

Add altq(9) explaining about the IFQ_* and IFQ_DRV_* macros in if_var.h and
how to convert drivers.

Obtained from: NetBSD (with changes)
Reviewed by: josef