- 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

Revert r256095, r256120 (partial), r256121:

r256095:
- Add gnu/usr.bin/rcs back to the base system.

r256120:
- Add WITHOUT_RCS back to src.conf.5.

r256121:
- Remove UPDATING entry regarding gnu/usr.bin/rcs removal.

Requested by: many
Approved by: re (marius)
Discussed with: core

This commit was generated by cvs2svn to compensate for changes in r11891,
which included commits to RCS files with non-trunk default branches.

Import rcs-5.7, required for full support of cvs-1.6.

This is going to be pretty messy.... Although the vendor import was correct,
both the vendor and release tags are the same "gnu"... :-/
Getting cvs to choose the correct one might be rather interesting...