use the same version as in HEAD
(among other things, the -v flag to make is long since unsupported)

MFC r262499, r262505, r262507, r262509:

r262499:
release.sh:
- Add a VCSCMD variable that defaults to 'svn checkout',
and update places 'svn co' is used directly.
- After sourcing a configuration file, prefix SRCBRANCH,
PORTBRANCH, and DOCBRANCH with the SVNROOT.
- Properly capitalize 'FreeBSD.org' in the default SVNROOT.
- Update Copyright.

release.conf.sample:
- Add an example to use git instead of svn, by nullifying
SVNROOT, and setting SRCBRANCH, DOCBRANCH, and PORTBRANCH
to the URL fo a git repository.

release.7:
- Document VCSCMD.

r262505:
In release/Makefile, remove exclusion of CVS directories in the
src/ and ports/ distributions.

While I am thinking about it, exclude .git directories for src/
and ports/, as somewhat of a followup to r262499.

r262507:
Chase r262505, and remove CVS exclusion from picobsd builds.

r262509:
Rework how WORLD_FLAGS and KERNEL_FLAGS are set, to remove an
unnecessary expr(1) call.

Sponsored by: The FreeBSD Foundation

use the same version as in HEAD
(among other things, the -v flag to make is long since unsupported)

MFC r262499, r262505, r262507, r262509:

r262499:
release.sh:
- Add a VCSCMD variable that defaults to 'svn checkout',
and update places 'svn co' is used directly.
- After sourcing a configuration file, prefix SRCBRANCH,
PORTBRANCH, and DOCBRANCH with the SVNROOT.
- Properly capitalize 'FreeBSD.org' in the default SVNROOT.
- Update Copyright.

release.conf.sample:
- Add an example to use git instead of svn, by nullifying
SVNROOT, and setting SRCBRANCH, DOCBRANCH, and PORTBRANCH
to the URL fo a git repository.

release.7:
- Document VCSCMD.

r262505:
In release/Makefile, remove exclusion of CVS directories in the
src/ and ports/ distributions.

While I am thinking about it, exclude .git directories for src/
and ports/, as somewhat of a followup to r262499.

r262507:
Chase r262505, and remove CVS exclusion from picobsd builds.

r262509:
Rework how WORLD_FLAGS and KERNEL_FLAGS are set, to remove an
unnecessary expr(1) call.

Sponsored by: The FreeBSD Foundation