joystick module fixed with proper event handling, added easyFly2 USB + Optic6 TX

Hello, thank you for MAVProxy.

Would you pls to merge my fixes:
1) Proper joystick events handling has been implemented
2) Added/tested support for my IPACS easyFly2 USB dongle with Hitec Optic 6 TX

Regards,
Dmitry Prokhorov