- 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

Build usr.bin/ with WARNS=6 by default.

Also add some missing $FreeBSD$ to keep svn happy.

Correct some style nits that I have mistakenly submitted as
suggestions which result in the last revision[*]:
- style(9) and sysexits(3) suggests that we use EX_*
as exit values, instead of some other values like
those returned from a system call as errno.

Additionally, follow Ruslan's suggestion about style(9) and
other style improvements:
- Since open(2) says that it returns -1 on errors,
explicitly determine whether it is returning -1
rather than whether the return value is less than
zero.
- Only set rval when there is no previous error.
This distinguishes the first error that occours.
- Use exit() in favor of return in main(), this is
suggested in old style(9), while the evolve has
fade the suggestion.
- Add some NOTREACHED comments.
- Add blank line after first { because no local variables
in usage()

Thanks to Ruslan for his tireless explaining of the code standards
and knowledge of the history of style(9).

[*] Pointy hat to: me

Submitted by: ru (with some minor changes)
Discussed with: ru, ssouhlal

Document the recent fsync(1) changes.

Requested by: delphij
Reviewed by: simon, ru
Approved by: grehan (mentor)

In case of error, return errno, instead of 1.

Suggested by: delphij
Reviewed by: delphij
Approved by: grehan (mentor)

- Continue, in case of error.
- Add WARNS?= 6

Submitted by: Liam J. Foy <liamfoy@gmail.com>
Approved by: stefanf, grehan (mentor)

Consistently use FBSDID

Remove leaf node WARNS?=2 (that mainly I added). This should
help the GCC3 transition and CURRENT in general.

MFS: in HISTORY section, fix release number of first appearance

Set WARNS=2 on programs that compile cleanly with it; add $FreeBSD$
where necessary.

Submitted by: Mike Barcroft <mike@q9media.com>

Include missing header files which define functions for which gcc has
builtins (e.g., exit).

Submitted by: Mike Barcroft <mike@q9media.com>

mdoc(7) police: use the new features of the Nm macro.

Avoid the need to capitalize an extraneous argument to the Nm macro
and be more precise about the handling of command-line arguments.

Reviewed by: ps

Typos and spelling fixes.

Submitted by: charnier

Oops. fsync(8) should have been fsync(1). (repo-copied by peter)
Change reference from update(4) to syncer(4).

Add fsync(8). This becomes useful with the advent of MAP_NOSYNC etc.

Reviewed by: peter