ImagePlus implements AutoCloseable

[Michael Ellis]

Would it be useful for ImagePlus to implement AutoClosable so it could be
used with Java's try with resources syntax?

Of course, the behaviour can be implemented by subclassing ImagePlus:

class ImagePlusAC extends ImagePlus implements AutoCloseable {

    public ImagePlusAC(String title, Image image) {
        super(title, image);
    }

   // And the other constructors
}

And that works nicely... but... I cannot see any obvious downside to
ImagePlus just being tagged as AutoClosable.

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