Flash programing on the K66 has to be units of 8 bytes. So we cache
   the write of words until there are 2 written. Then the 2 words are
   written to FLASH. This change ensure the bin file has an even
   number of (4 byte) words by padding the last section in progflash
   with 0xffffffff if needed.

   On the K66 we use the first word of the Battery backed up RAM
   as the bootloader - app communication location.

   Since nxphlite V1 was never released, we reused that code point.

   Since the only device on the bus is the barro, int or ext does
   not apply. This will be fixed on the rev > RC15.
   This defines an alias that can be used to condition the buss logic
   connection logic px4_i2c_bus_external to return external.

  Tone Alarm driver was using hrt and tunes. Hence no start up tune.
  Integrated the tune control and removed note cruft.

Use './Tools/run-shellcheck.sh ROMFS/px4fmu_common' to run it.

This info is on the dev-guide now

This also removes the HIGHRES_IMU mavlink stream to the GCS. I don't see
why it's needed and it adds noticeable CPU load.

RC input is now handled via rc_input module

Use 'if ! <cmd>' instead.

The command is now: 'make posix none_shell'
which means: don't start a simulator and run a minimal shell only.

The FIFO was created in the server thread, and the PX4 main thread could
already have continued and started to execute the bash script.
In that case the client tried to open the FIFO but it did not exist yet.

Client error:
ERROR [px4_daemon] pipe open fail
ERROR [px4_daemon] Could not send commands