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Thanks to: 
Matthias Wandel <matt@rim.net> 
jhead (http://www.sentex.net/~mwandel/jhead/)

Groult Richard <rgroult@jalix.org>
showimg (http://ric.jalix.org/)

Bryce Nesbitt for setcomment
based on wrjpgcom.c, Copyright (C) 1994-1997, Thomas G. Lane.

EXIF spec: 
http://www.pima.net/standards/it10/PIMA15740/exif.htm
http://www.ba.wakwak.com/~tsuruzoh/Computer/Digicams/exif-e.html

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Bugs:
    1) utf-8 paths must be tested and supported.
    2) Display of EXIF comments need to be tested.
       Both Unicode & ASCII need testing.

New features needed:
    1) Should switch to a multi-line editor for comments.  Support "\n".
    2) Should autodetect if the jpeg COM is in utf-8 format. 
    3) Allow editing the EXIF "Orientation" flag (without rewriting the exif header).
    4) Extract and return the EXIF thumbnail, oriented properly, as an alternative
       to the much slower process of generating a new thumbnail.

Future features:
    1) Allow the user to erase or move comment in either the EXIF or jpeg COM.
    2) Play or return audio files associated with the exif.

