Throttle doesnt hit zero after landing

[ambattuhari (Hari .P)]

Copter-3.6.7-rc1 released for beta testing

Copter-3.6.7-rc1 has been released for beta testing and can be installed using the Ground Stations’ “beta firmware” link. This is a relatively minor update from 3.6.6 with just four fixes that are in the ReleaseNotes and also listed below. Changes from 3.6.6 Bug fixes and minor enhancements a) Matek405-Wing compass fix (thread initialisation fix) b) Flips during landing reduced by reducing I-term build-up c) Land mission command slows down less aggressively d) Lightware LW20 lidar more r…