Re-work the way pre-install was being depended.  I couldn't make the install cookie work any other way (perhaps I'm just being stupid). In any case, INSTALL_COOKIE now works as advertised, and prevents duplicate installations.  pre-install users will have to keep their own cookies if they wish to avoid duplicate installations, or tell me how to make the rules run properly.
Re-work the way pre-install was being depended.  I couldn't make the
install cookie work any other way (perhaps I'm just being stupid).
In any case, INSTALL_COOKIE now works as advertised, and prevents duplicate
installations.  pre-install users will have to keep their own cookies if
they wish to avoid duplicate installations, or tell me how to make the
rules run properly.

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