exit from the autpilot when reboot is commanded.
The software assumes that the code is being
launched in an infinite loop thereby an exit
will make it reboot.

Preliminary support for Zynq/Linux on the 'ZyboPilot' HW platform.

see https://github.com/trjw/ZyboPilot-bsp

 for the PetaLinux / Vivado project
files.

At this stage CPPM/Pulse in and PWM out work, and in CLI mode the passthru
test works correctly.

The platform has passed minimal smoke testing in HIL mode.

ZYNQ IS NOT FLIGHT TESTED YET!  FLY THIS PLATFORM AT YOUR OWN RISK!

Signed-off-by: John Williams <john@whelanwilliams.net>

too many people are still not tuning. At least this will give them a
chance to get their aircraft back in a cross-wind

allows airspeed calibration to be skipped for easier startup

makes it more obvious where the build ends up

this creates a core file

try to catch floating pt exception causes

this will allow users to disable it if it proves to be a problem with
no airspeed sensor

fixes issue #1555

this calculates the aerodymanic load factor from smoothed airspeed and
uses it to limit roll to keep it below the level where the load factor
would take us past the aerodymanic limit of the airframe

this will push up minimum airspeed when turning

this allows the use of an external temperature sensor for calibration
purposes, such as the sensor built in to the digital airspeed sensor.

The main affect this has is on the EAS2TAS calculation

The get_calibration_temperature() is used to choose either an external
temperature or an internal one. If an internal one is used then it is
clamped at no higher than 25 degrees C, to prevent hot electronics
on startup affecting altitude scaling and EAS2TAS

changes default Tv to be 1/1600 (higher) and ISO to be lower 200/800
Max1/Max2.  Should produce more crisp images in low light.

initial commit

The do_take_picture() function must be called for logging to occur.
configure_msg is empty at the moment so the call to this is remove

The do_take_picture() function must be called for logging to occur.
configure_msg is empty at the moment so the call to this is remove

thanks to John Williams for pointing it out