stopping server does not remove external_pid_file

Hi PostgreSQL developers,

I just played around with external_pid_file in 8.1.4. I noticed that
the file is created and filled properly, but it is not removed again
when the server is stopped.

Thank you,

Martin
--=20
Martin Pitt        http://www.piware.de
Ubuntu Developer   http://www.ubuntu.com
Debian Developer   http://www.debian.org

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