solo-1.2.20

diff from solo-1.2.17:

• LED code cleanup
• improve "calibrating sensors" behavior after landing when there are GPS vertical velocity biases
• fixes EKF issue causing GPS glitch immediately after takeoff

diff from solo-1.2.19 (public release):

• re-introduces dataflash logging changes
• LED code cleanup
• improve "calibrating sensors" behavior after landing when there are GPS vertical velocity biases

solo-1.2.19

diff from solo-1.2.18:

• fixes EKF issue causing GPS glitch immediately after takeoff

solo-1.2.18

diff from solo-1.2.17:

• reverts all dataflash logging changes

solo-1.2.17

diff from solo-1.2.16:

• corrects regression relating to gimbal yaw

solo-1.2.16

diff from solo-1.2.15:

• fixes potential race conditions between radio failsafe and FLY/PAUSE button events

Contains regression: bad initial state in gimbal yaw controller

solo-1.2.15

diff from solo-1.2.14:

• loosens gimbal yaw

Contains regression: bad initial state in gimbal yaw controller

solo-1.2.14

diff from solo-1.2.13:

• change ATC_LEAD_RLL_W to 15

solo-1.2.13

diff from solo-1.2.12:

• adds lead filter on roll to eliminate 10.5hz shake

solo-1.2.12

diff from solo-1.2.11:

• slight roll tune backoff to add margin at high altitude
• allows EKF to regain GPS after prolonged loss
• dataflash-mavlink support
• reverts changes to prearm messages causing frequent "level error"

solo-1.2.11

diff from solo-1.2.9:

• removes air density compensation that was causing issues during high-elevation flight
• prevent large rotation rates from causing the magnetometer reset to fail
• add MAV_CMD_SOLO_BTN_PAUSE_CLICK to de-race the PAUSE button
• loosens yaw again - flight test resulted in some disturbances getting through
• fix dataflash log deletion so that it correctly finds the oldest log after wraparound
• new shutdown sound!