Sync as close as possible with NetBSD.

This includes fixes and cleanups listed below:

- If a process dissappears while we are signalling it, don't count it as a
  match/error.
- Better handling of errors and messages.
- Downgrade failure to kill(2) (other than ESRCH) from fatal error to a
  warning; otherwise processing aborts and possibly matching killees would
  remain unsignalled. This makes pkill match the Solaris behavior.
- Exit with 2 on usage errors as documented.

Obtained from:	NetBSD
Glanced at by:	maintainer (gad) [a bit different version of this patch]

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