Add support for run-time configuration of core file names.  In a nutshell, you can specify the corefile name by using:
Add support for run-time configuration of core file names.  In a nutshell,
you can specify the corefile name by using:

	sysctl -w kern.corefile="format"

where format is a pathname (relative or absolute -- default is "%N.core"),
with "%N" (process name), "%P" (process ID), and "%U" (user ID) formats.

Reviewed by:	Mike Smith, with strong requests by Julian :)

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