4.3.0

Debugging support for AVX (YMM) registers.
Optimizations for tracees doing heavy I/O, when on btrfs.
Support for dconf's shared memory.
Much better support for vfork.
Support for tracees calling setuid() (when rr is running as root).
Support for tracees compiled with AddressSanitizer.
Support for optimized release builds: -DCMAKE_BUILD_TYPE=Release (thanks to Keno Fischer).
Some internal cleanup (thanks to Keno Fischer).
Syscall support expanded.
Many bugs fixed, including support for Ubuntu 16.04, Fedora 24 and latest grsecurity kernels (thanks to Brad Spengler).