public test data for Philips TIFF

[Benjamin Gilbert]

Hi Jakub,

On Mon, Oct 2, 2023 at 12:42 PM Kaczmarzyk, Jakub via openslide-users
<openslide-users at lists.andrew.cmu.edu> wrote:
> I believe the CAMELYON16 dataset has images in Philips TIFF format, and these scans are license CC0.

Thank you very much for pointing this out!  I'll add a slide to the
openslide-testdata repository and some test cases to the OpenSlide
test suite.

Best,
--Benjamin Gilbert