I/O stats for lmtp, imap and pop

[Wesley Craig]

getrusage() "works" on all platforms, AFAIK, at least in the POSIX sense: the fields are there, and they may or may not be filled in, but everything will compile.  This is why I wonder if specifying a what usage ought to be logged (including nothing) wouldn't make sense.  If you're on a platform that doesn't report I/O, that's your problem.  If you aren't concerned with usage reporting, turn it off.

:wes