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

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

Remove the advertising clause from UCB copyrighted files in usr.bin. This
is in accordance with the information provided at
ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change

Also add $FreeBSD$ to a few files to keep svn happy.

Discussed with: imp, rwatson

ANSIify function definitions to avoid a warning.

ctags would create a corrupt tags file if the source C file used '//' style
comments such as:

// The main() function

Teach ctags about this style of commenting.

Submitted by: Eric Allman <eric@Sendmail.ORG>
MFC after: 1 week

Remove unused #includes. lex -> Lex, yacc -> Yacc, ... Some .Nm to .Em
conversions. Sort #includes. Spelling. use errx() instead of err() when
explicit message is given.

Style improvements recommended by Bruce as a follow up to some
of the recent WARNS commits. The idea is:

1) FreeBSD id tags should follow vendor tags.
2) Vendor tags should not be compiled (though copyrights probably should).
3) There should be no blank line between including cdefs and __FBSDIF.

Use __FBSDID().

Add $FreeBSD$

MFC after: 2 weeks

Tweaks to allow compiling -Wall (mostly adding "const" to char rcsid[]).

-Wall cleanup.

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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