fix parsing of split header/envelope rewriting rules

fix a wierdness on handling -o override options

update for MIME encapsulated error messages

change option 8 to option 7 (and invert semantics)

first cut at updated alias implementation

move #include <sys/stat.h> into conf.h

move compatibility hooks for S_ISREG et al to conf.h

extend "b" option to include maximum message size

clean up handling of F line

patches to XLA code

Extended Load Average (XLA) hooks

add Directory mailer field

diagnose bogus privacy flags

O (set daemon options) and V (fallback MX host) options

MATCHZERO doesn't assign a $N value

improved debugging; pass convtime a default units; allow addition
of Comments: and stripping of Return-Path:

add X-Authentication-Warning: headers on possible attempts at forgery

include a warning timeout after some interval; get rid of QueueRun
global and put it in the envelope; some other minor bug fixes

move SendMode and ErrorMode into the envelope

compile warning cleanups

changes for ESMTP; mostly better delimiter character pointer passing

header file cleanup; primarily #include <unistd.h> in sendmail.h
and delete duplicate cruft

check for A= and P= arguments

allow $@ on LHS to indicate match zero tokens

delete trusted users code; it's too easy to circumvent