- 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

Initializate "offset" variable to zero; otherwise, if not using
the -o option, it might contain garbage.

MFC after: 1 day

Start the dreaded NOFOO -> NO_FOO conversion.

OK'ed by: core

Yesterday, FreeBSD-current ate my disklabel.
Today, I wrote a program to tell me where the partitions used to be.
Now I have my /media filesystem back.