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

 *) Sync with 4.4BSD-Lite2
 *) Set usecs for utimes()
 *) Add 'inc' command and 'autoinc' option that check for new mail
    manually and automatically, respectively
 *) Use POSIX signal handling and tty semantics
 *) Handle long lines correctly when paging messages
 *) Add ability to explicitly search 'To:' line
 *) Various manpage cleanups
 *) Support overriding '~/.mailrc' with $MAILRC
 *) Support 'askbcc' and 'asksub' options
 *) Fix various bugs

Reviewed by:	ru (mail.1)
Obtained from:	NetBSD

Also take a stab at cleaning up BDECFLAGS and convert all uses of
NOSTR, NIL, NONE, NOVAR, NOGRP, NOGE to NULL. Also kill 'register' to
get diffs somewhat closer to OpenBSD/NetBSD.

There are no functional changes however.
Reviewed by:	nra (visual inspection)

o remove panic() in favor of err(3) and use err(3) functions
  consistently throughout
o use stat(2)'s S_IS* macros rather than S_IF*
o [r]index -> str[r]chr
o convert some static buffers to dynamic ones
o use real tempfiles rather than reopening the same templates
o rename some functions that clash with libc
o convert wait_status from union to int and use wait(2) status macros
o fix multiple potential buffer overflows
o fix a few comments
o add $FreeBSD$

Reviewed by:	nra, nectar (earlier version)

undelete() syscall.

Submitted by:	partly by roberto