Thank you!  For anyone else who wants to do this, he starts talking
about lensfun at the 30 minute mark, and starts actually showing the
process at 40 minutes in.

 He also skipped over how to compute chromatic aberration due to lack
of time, but I think this is the tool that does it:
http://hugin.sourceforge.net/tutorials/tca/en.shtml

 The lens distortion computation is described in the video, and needs
parallel lines to be defined in the picture, and also here:
http://wiki.panotools.org/Lens_correction_model

 Computing the vignetting correction is discussed here:
http://wiki.panotools.org/Vignetting and
http://wiki.panotools.org/Hugin_Exposure_tab

 The lens parameters we need to describe for the DB are defined here:
http://lensfun.berlios.de/manual/group__Lens.html

 Hope those pointers help other people.  I will try to put together
something more detailed when I get a chance to try it with my camera.

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