Clean up argument structure (-I=>-bi, -Z=>-bz). Add -bp stub to someday

Clean up argument structure (-I=>-bi, -Z=>-bz).  Add -bp stub to someday
print queue.  Move compile conf into conf.h (still some stuff in the
Makefile).  Assume -bp if called as "mailq" and -bi if called as
"newaliases".  Drop old directory hack -- send out compat code instead.
Don't rebuild the alias file automatically unless the D option is set.
Clean up compilation flags.

SCCS-mr: usr.sbin/sendmail/src/version.c 021, 066, 069, 069, 070, 071
SCCS-vsn: usr.sbin/sendmail/src/version.c 3.241