NeXT changes

use NeXT as compile flag -- apparently NeXT cc auto-defines this

output YP_MASTER_NAME and YP_LAST_MODIFIED without null bytes.

portability enhancements: NeXT and SCO

improved messages on error return

try to recover more gracefully from existing tf file condition

fix statistics gathering; NeXT portability

fix statistics gathering

improved debugging

signal and file locking portability changes

fix problem causing errors during collect to supress 250 message

move IDENTPROTO defines around to simplify turning it off on a
per-OS basis

prefer HASGETDTABLESIZE over _SC_OPEN_MAX: a disturbingly large
number of systems define _SC_OPEN_MAX in the header files but then
don't implement the sysconf() syscall.

really ignore MX records if !trymx

command line mail to bad recipients didn't return error message;
don't call getcanonname from getmxrr if you know it will fail; don't claim
that all messages were received from localhost in error mes

command line mail to bad recipients didn't return error message;
don't call getcanonname from getmxrr if you know it will fail; don't claim
that all messages were received from localhost in error messages

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tag returned message with true original from (not localhost)

fix non-return of addresses presented on the command line

really ignore MX if !trymx in getcanonname; minimize unnecessary
nameserver calls

Many changes: add option 2; fix FIN_WAIT_2 problem; fix some mail
drop problems; many portability changes; many other minor changes

fix bogus error message with open timeout in :include: -- this also
fixes a bug that caused resolver errnos to conflict with real errnos

fix problem causing bogus delivery of SIGTTIN on POSIX systems

SCO UNIX changes

bulk clear flock structure -- some systems apparently have some
additional fields that will cause "bad argument" messages

don't improperly diagnose alias/forward loops (although this misses
some)

Convex changes