fix a variety of small bugs noticed by bcx

fix "user open" setproctitle message

fix from address on "too many hops" message

miscellaneous changes to improve logging and messages

lint

reduce number of instances of CurEnv by passing it as a parameter

child pid not getting changed; \quoted names were still forwarded

make eight-bit clean; backslashes are carried through as-is

open connection caching

checkpoint: putting in connection caching

more connection caching hacks

ignore setuid bits on files if address was passed through a .forward
or :include: file -- this avoids a security problem that comes up
with System V Release 4, reported by Dave Borman

partial hooks for caching all email connections; won't work
because it could result in too many connections, and some could
time out.

check I/O status when appending to files

clean up #ifdef configuration to more cleanly match the modern age

allow limited 8-bit support; allow [TCP] as an alias for [IPC], even
though it's wrong; restore t option for System V support; add L=_N_
mailer option for line lengths; implement R mailer flag to get

allow limited 8-bit support; allow [TCP] as an alias for [IPC], even
though it's wrong; restore t option for System V support; add L=_N_
mailer option for line lengths; implement R mailer flag to get
restricted port; misc cleanup

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separate support for header vs envelope sender; if users are in the
database, map them to a canonical name (e.g., @CS.Berkeley.EDU) in header.

convert lockf implementation to use fcntl directly

fix race condition in queue file locking; generalize getla

change lockf code to avoid race condition

fix lockf code; have getcanonname recognize canonical names

hacks for systems with lockf, not flock

fixes for user database and new config files

if config level >=2, don't reset RES_DEFNAMES|RES_DNSRCH

some changes to enhance compatibility with SunOS sendmail