Move SNAPPY libraries to github
This is from one of our IPCAI reviewers. Could we move the core opensource libaries to github to make it easier for people to contribute?
"Gitlab isolates your efforts from the rest of the world. Currently, it does not even seem possible to sign up at https://weisslab.cs.ucl.ac.uk/. Hosting on github would increase visibility and willingness of people to submit bug reports or contribute. If you must host your own repository then at least host an official github mirror to avoid cropping up of unofficial forks."