Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Implement "addr1,+N" ranges - not dissimilar to grep's -A switch.

PR: 134856
Submitted by: Jeremie Le Hen - jeremie at le-hen dot org

WARNS fixes:
1) Add missing parens around assignment that is compared to zero.
2) Make some variables that only take non-negative values unsigned.
3) Some casts/type changes to fix other constness warnings.
4) Make one variable a const char *.
5) Make sure termwidth is positive, it doesn't make sense for it to be negative.

Approved by: dds

Add case-insensitive matching to sed, using the 'I' flag, similarly to GNU sed.
For example,
sed /foo/Id
sed s/foo/bar/Ig

Reviewed by: dds
Approved by: re (hrs)

Per letter dated July 22, 1999 remove 3rd clause of Berkeley derived
software (original contributor).

Reviewed by: imp

Make the 'y' (translate) command aware of multibyte characters.

Remove local redefinition for err(). Add usage().

Merge various fixes from NetBSD. This will allow the WordPerfect for
SCO installation to run all the way through (some POSIX fixes).

This commit was generated by cvs2svn to compensate for changes in r1590,
which included commits to RCS files with non-trunk default branches.

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