Release 1.9

OS updates, including fixes for recent OpenSSL vulnerabilities. Kernel updated to 4.1.13.

Improved device support: Corrigo Ventilation Killswitch Support more registers & programs in Corrigo Ventilation Controls Improved multi-message mbus meters Multi-threaded modbus reading Corrigo Heating support for Heating System 2, Differential Pressure and more On device network statistics * Further deprecation of Python2 code