flat packages

[Joshua Root]

It came up in a private conversation that we should really be generating
flat packages in 'port pkg' these days, at least for current platforms.
Unfortunately, if you set package.flat currently, even though all the
resources end up in the package (which you can check by extracting it
with xar), none of them get used. That means no InstallationCheck script
(and probably no postflight), no Welcome.html, no ReadMe or license, and
no background image.

Is anyone familiar enough with the packagemaker CLI and/or flat packages
in general to know how to do this stuff correctly?

- Josh