Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

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

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

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

remove __P

WARNS=2 fix, kill register keyword, use __FBSDID().

NO_WERROR set because of hard-to-fix warnings originating in
system headers.

Change the name of a variable from _start to s_start. On alpha there
must be a library function called _start.

Slightly improve the C and C++ support. Allow for function return
types being on the same line as the function name, this finally closes
PR # bin/1785. Also allow :: and ~ as part of the function name, for
C++.

Still, C++ operator overloading will not be recognized as a valid
function name. Fixing this would require a major overhaul of the \p
recognition parser.

Some cleanup:

. correct a typo in regexp.c,
. implement a new "nc" (non-comment) feature to describe exceptions from
the comment detection; there were problems in Perl with the $# operator
that could not be solved by any other means,
. prevent blocklevel from becoming negative (due to earlier misdetected
sequences), this is probably a workaround for the problem described
in PR # bin/1785,
. update the Perl description to use the "nc" feature,
. update the man page for the "nc" and the undocumented "ab"/"ae"
features.

Remove trailing whitespace.

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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