0.7.2

[Hashback] Added error handling in compression threads to avoid the "send on closed channel" panic
[Hashback] Changed how hashback is closed down when Interrupt or Kill signals are received
[Hashback] Fixed a design mistake where recovery cache was not saved on panics
[Hashback] Debug web server now only listens to 127.0.0.1 to avoid firewall pop-ups on Windows