Addition of optional sharpening to resize. #31
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Resize creates quite soft, blurry images as it does not apply any sharpening to the resized image. I've added optional support to Resize for sharpening the image as a final step by passing in a sharpening struct with the required arguments.
I've also started to add support (only in vips.h for now) for the basic vips_resize which will scale an image, and sharpen (although not controllable) in one simple call to libvips.