The sound distributed version control system

Remove dependency on `num_cpus`

Since std::thread::available_parallelism has been stabilised, use that instead

Created by  finchie  on June 11, 2023
DAD6VPVMOCIO7MRJLYCBBV4W4YTBM2O3LLNMHWSZ65TBOY5QCXZAC
Dependencies
Change contents