Low-level bindings to the openslide library
To be able to build this crate you need to install [OpenSlide](https://github.com/openslide/openslide)
You will also find a Makefile to help you install all required dependencies for Ubuntu and MacOs
```bash
brew update
brew install openslide
```
```bash
apt-get update
apt-get install -y --no-install-recommends libopenslide-dev
```