More accessible machine learning functionality

• Easier-to-use machine learning interface
• Integrated compilation-execution facility
• Import/export sequential models and parameters from/to PyTorch
• Binary-format input files
• Less aggressive round optimization for faster compilation by default
• Multithreading with client interface
• Functionality to protect order of specific memory accesses
• Oblivious transfer works again on older (pre-2011) x86 CPUs
• clang is used by default