Implementation notes by Pat Tullmann (pat@tullmann.org)

I used the data from 
	http://www.ba.wakwak.com/~tsuruzoh/Computer/Digicams/exif-e.html#APP3
and
	http://www.dicasoft.de/dicainfo.htm
in late July 2001 to write casiotags.cc.  

I based all the code I wrote on the canontags.cc and they dpy* code in
metacam proper.

I tested the casiotags on pictures generated from a Casio QV2000-UX.

The http://www.dicasoft.de/dicainfo.htm source indicates that a some
Casio cameras use a software revision that doesn't generate EXIF
makerinfo tags.  Also, the "Object Distance" field is probably bogus.
There are also several fields that are not yet reverse engineered.
