- 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

grep -i does not work for simple patterns and single byte locales, like
LANG=ru_RU.KOI8-R grep -i <some single KOI8-R letter>
Fix it.

MFC after: 3 days

Revert r246917, as it is causing incorrect behaviour as reported on
freebsd-current.

PR: bin/175213
Approved by: emaste (co-mentor)

Strengthen the check in IS_OUT_OF_BOUNDS to ensure that (j - 1) is a
valid index into the input buffer.

PR: bin/175213
Reviewed by: gabor
Approved by: emaste (co-mentor)
MFC after: 1 week

Fix a segfault when bsdgrep -i is given an empty pattern string.

PR: bin/172865
Reviewed by: gabor
Approved by: emaste (co-mentor)
MFC after: 1 week

- Use getprogname() instead of __progname
- Allow disabling bzip2 support with WITHOUT_BZIP2
- Fix handling patterns that start with a dot
- Remove superfluous semicolon

Approved by: delphij (mentor)

Fix build on i386 and arm.

Tested with: make universe
Pointy hat to: delphij

Update BSD grep to the latest development version. It has some code
backported that was written for the TRE integration project in Google
Summer of Code 2011. This is a temporary solution until the whole
regex library is not replaced so that BSD grep development can continue
and the backported code gets some review and testing. This change only
improves scalability slightly, there is no big performance boost yet
but several minor bugs have been found and fixed.

Approved by: delphij (mentor)
Sposored by: Google Summer of Code 2011
MFC after: 1 week