- ecl in PX4/Firmware (bd71d1cd9e1e1d29f89351c43f879e6c49b727bc): https://github.com/PX4/ecl/commit/f240eaa5b089c50b957a3ab61aeb722ea57dccd9
    - ecl current upstream: https://github.com/PX4/ecl/commit/10a0fef7b7db749f5baf3384e9c900d3aa0e8140
    - Changes: https://github.com/PX4/ecl/compare/f240eaa5b089c50b957a3ab61aeb722ea57dccd9...10a0fef7b7db749f5baf3384e9c900d3aa0e8140

    10a0fef 2018-10-18 jie.zhang - EKF/control: remove unnecessary yaw_align update
8bbaf89 2018-10-17 Daniel Agar - EKF add new simple setIMUData() interface (#512)
e6cd6ef 2018-09-03 Paul Riseborough - EKF: Fix bug preventing  use of flow sensors without gyros
2c3a064 2018-09-18 Daniel Agar - README.md update Jenkins build status icon and url

removed px4_poll, something changed and broke the way I was using it. This has been tested successfully

mc_pos_control_main smooth takeoff: enable position-xy/yaw control once above 0.5m from takeoff reference

just keep thrust vector pointing upward

smooth-takeoff. This is only required if someone writes a FlightTask where both position
and velocity setpoints are finite

made changes based on reviewer feedback. Also added a bool option for block_read and block_write PEC, as some devices may not use the PEC

    - libuavcan in PX4/Firmware (8958b42dada1e14f27c287a59b51ff26e90486a1): https://github.com/UAVCAN/libuavcan/commit/479d144ded9d5d16e234121ef9511b9ca9dfdac5
    - libuavcan current upstream: https://github.com/UAVCAN/libuavcan/commit/6174b8c10a2dbf47076ca7a7b5820a4c36c8a988
    - Changes: https://github.com/UAVCAN/libuavcan/compare/479d144ded9d5d16e234121ef9511b9ca9dfdac5...6174b8c10a2dbf47076ca7a7b5820a4c36c8a988

    6174b8c 2018-10-06 Pavel Kirienko - Link to the new forum

-Rearranged bus options to match other drivers
-Added TODO statement because driver cannot yet start on a specific external bus

- Added two external I2C bus options corresponding to newer Pixhawk hardware (px4fmu-v5)
- Switched from getopt to px4_getopt
- Fixed bus checking loop exiting early

vehicle state.