Changed the JPEG writer to raise a warning when the exif profile exceeds 65533 bytes and truncate it.

When writing LEGO MINDSTORMS EV3 .rfg file, if the image is not a
multiple of 8 pixels wide, the pixels in the last byte are not aligned
correctly. The pixels need to be shifted the number of bits that are
not used in the last byte.

The rgf format (LEGO MINDSTORMS EV3 images) caused a software abort because
exception == NULL. When WriteRGFImage is called from WriteImage, it is only
passed two parameters, not three. So, removed the extra parameter and use
image->exception instead as in other coders.

Always perform a seek after reading the mask to fix https://github.com/ImageMagick/ImageMagick/issues/216.