Maintenance

• Fixed security bug: malicious parties not committed to MAC key across threads and executions
• Fixed security bug: insufficient checks in Rep4
• Improved radix sort
• Optimized 32-bit computation
• Multithreaded Rep3 shuffling
• Improved benchmarking in binary virtual machines
• More sophisticated register allocation
• C++-20 requirement throughout
• Option for parametrized communication cost
• Use budget when merging function calls
• Timeout for compilation to allow identification of blowouts
• Option to disable index checks in loops
• File persistence for public integers