Allows a person to create an image of arbitrary size
without having to worry about the 516096 multiple
restriction. The multiple still applies, but now PearPC
just ignore the extra bytes at the end of the file if they're
more than a multiple of 516096. It also gives a warning
about how many bytes are being ignored at the end of
an image file.
ata.cc
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Also, added code to error out if file size is less than 516,096
bytes, or larger than 33,822,351,360 bytes