fix angle-bracketed-return-path problem; expand EF_IS_MIME

lint

make USERDB be a 0/1 option instead of #ifdef/#ifndef

updates for new DSN drafts

updates for new status system codes and Multipart/Report drafts

update copyright notice

fix postmaster notifications -- it was getting the body in
some inappropriate cases, and sometimes no message at all; clean up
dead.letter processing

fix botch in saving from domain for later insertion onto
unqualified addresses

MIME cleanup to get header line parsing right

merge a bit with Sun version

pull getpwXXX and gethostbyXXX calls out into conf.c so they can
be tweaked

more cleanup for DSN drafts

improved debugging for envelope flags

eliminate `D' line in qf file

new DSN draft

change call to expand() to be more rational (and consistent!)

line-buffer transcript file

make fdopen() mode compatible with open() mode

fix conflict between open file mode and stdio fdopen mode

if we have FATALERRS set but no errors in addresses, set errors
in all the addresses

restore PRIV_NORECEIPTS flag, even in DSN mode

clean up several small problems with file delivery, error detection,
and return receipts

cleanup for return-receipts

avoid sending a message back on bogus failure

convert to new DSN draft