- Copy stable/10@296371 to releng/10.3 in preparation for 10.3-RC1
builds.
- Update newvers.sh to reflect RC1.
- Update __FreeBSD_version to reflect 10.3.
- Update default pkg(8) configuration to use the quarterly branch.

Approved by: re (implicit)

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

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

Thanks to David's patches, we can now simplify these makefiles
further, and just use PROG directly (without FILES).

Suggested by: bde

Bring back jhb's two sector (1024 bytes) 'boot0' [rev 1.22] as 'boot0ext'.