[Zope] Retrieve zope.conf path

[Gabriel Genellina]

Hello

How could I retrieve the path to the config file used to start a running 
instance?
I want to put other config stuff in the same directory, and I would like a 
safe way to obtain such directory.
I could use INSTANCE_HOME/etc but since the config file name can be 
specified in the command line, it might not be there.


Gabriel Genellina
Softlab SRL