- Copy stable/10 (r259064) to releng/10.0 as part of the
10.0-RELEASE cycle.
- Update __FreeBSD_version [1]
- Set branch name to -RC1

[1] 10.0-CURRENT __FreeBSD_version value ended at '55', so
start releng/10.0 at '100' so the branch is started with
a value ending in zero.

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

Return NULL on error rather than ":", per the crypt(3) man page.
Discussed in: http://www.openwall.com/lists/oss-security/2011/11/15/3

Strip the private blowfish code down to only that which is
required to make crypt(3) blowfish "$2a$..." hashes. Lint and
warnsify.

No functional change, but big code cleanup. WARNS, lint(1) and style(9).

__FBSDID() (second half of src/lib/libcrypt changes)

Add OpenBSD-style blowfish password hashing. This makes one less
gratuitous difference between us and our sister project.

This was given to me _ages_ ago. May apologies to Paul for the length
of time its taken me to commit.

Obtained from: Niels Provos <provos@physnet.uni-hamburg.de>/OpenBSD
Submitted by: Paul Herman <pherman@frenchfries.net>