gEDA-dev: PCB Library regression

[DJ Delorie]

> Thanks for the info. Its all very Unix'y :)

Well, those names are the same as for .Xdefaults and gconfig.  The
help listing is just the easiest way to dump them.

> I'm seeing that multiple methods of getting footprints would have to
> co-operate at the LibraryListContents.sh / QueryLibrary.sh level
> though.

Yup.  PCB directly supports the program method and the direct file
method.