"Whoisnt"

Instructions:

make
sh whoisnt.sh <filename.jpg>

or

make
whoisnt <filename.bmp>

Output is limited to 4 characters (there are usually 5 or 6).

Some codes fail, but most get through okay. If you change the ErrorMargin to
12, example3.jpg works, but it breaks example2.jpg (the S doesn't display).
The ErrorMargin should stay at 11, and any images that don't work, don't.
