eliminate use of sin_len

bleah... one more time

one more instance of sa_len to delete

fix assumption of sa_len field in generic sockaddr -- no vendors
seem to have picked up this important feature; change configuration to
select one or both of NETINET or NETISO (but not DAEMON)

fix generalized socket code so that it doesn't screw up on older
vendor's systems; put INET support on separate compilation flag

POSIX & ISO changes; better I/O error diagnostics; fix bogus id
and bogus headers on returned mail problem; don't force all local names
to lower case; send warning messages when email has been queued

POSIX & ISO changes; better I/O error diagnostics; fix bogus id
and bogus headers on returned mail problem; don't force all local names
to lower case; send warning messages when email has been queued up for
a while; send su'ed email from original sender; use Postmaster as default
fallback address, not root; other misc stuff

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initial hooks for ISO networking

keep c0 static, otherwise it is undefined if no pid change

don't free header values -- they are still accessible from
BlankEnvelope

don't force local names to lower case -- this was left over from
the bogus alias mapping

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

if you are su'ed to root, send email as who you are, not as root

move SendMode and ErrorMode into the envelope

default fallback name is Postmaster, not root

check for error writing queue control files

POSIX changes; use dup2

clean up unnecessary creates of queue ids; be sure to instantiate
split envelopes in the queue; fix problem with leading spaces on
owner-aliases acting as delimiters

avoid extra unnecessary creation of queue files solely for an
unneeded id

leading blanks in aliases can cause "unparsable" from addresses

make certain we always enqueue split envelopes

there can be errors on mci_out if the other end shuts down early

glitch on queue printing

have 250 after DATA log the id; log envelope splits; change queue
ids to have one more letter to improve probability of uniqueness over
a 24 hour period

accept old-format queue files

add one more letter to queue names to encode the hour; this makes
queue ids more likely to be unique during any particular day