- 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

Correct double "the the"

Approved by: cperciva
MFC after: 3 days

Add two new locale-specific man pages:
- libc/stdio/scanf_l.3
- libc/stdio/printf_l.3

Reviewed by: theraven
Approved by: gabor (mentor)
MFC after: 5 days