Expand oiiotool geometry support for <float>%x<float>% syntax
ImageCache: Extend add_file() to allow an ImageSpec ptr as configuration,
which will be passed along to the ImageInput::open() (the "with config"
variety) when the file is first opened. This allows you to use the same
kind of configuration options/hints that you would with a raw
ImageInput, with files opened by the ImageCache.
ImageBuf: add ctr & reset methods to supply an ImageSpec as configuration,
which will be passed along to the underlying ImageCache and/or ImageInput
when the file is opened. This allows an ImageBuf to use the same kind of
configuration options/hints that you would with a raw ImageInput.