Features:
- Support for binary indexes (IndexBinaryFlat, IndexBinaryIVF)
- Support fp16 encoding in scalar quantizer
- Support for deduplication in IndexIVFFlat
- Support for index serialization
Bugs:
- Fix MMAP bug for normal indexes
- Fix propagation of io_flags in read func
- Fix k-selection for CUDA 9
- Fix race condition in OnDiskInvertedLists