The code has moved. It now lives in its new permanent home at:
Thanks to Juan Macias-Perez, Eiichiro Komatsu, Ryu Makiya, Barabara Comis, Julien Lesgourgues, Jens Chluba, Colin Hill, Florian Ruppin, Thejs Brinckmann, Aditya Rotti, Mathieu Remazeilles, David Alonso, Nick Koukoufilippas, Fiona McCarthy, Eunseong Lee, Ola Kusiak, Simone Ferraro, Mat Madhavacheril, Manu Schaan, Shivam Pandey, Alina Sabyr, Yogesh Meta, Kristen Surrao for help, suggestions and/or running tests with class_sz before its moved to its new home.