Prior to onshot being added to the system. The -r of the
   "rate" command would not invoke the ioctl PWM_SERVO_SET_UPDATE_RATE
   when -r was not provided on the command line. This may have been a
   feature or a bug.

   When onshot was added to the pwm command a bug was intorduced
   that precluded the ioctl PWM_SERVO_SET_UPDATE_RATE from being
   called on -r 0.

   This commit fixes that issue, and preserves the "prio to oneshot"
   behavior of the "rate" command when -r is not specified.

In case of an invalid output mode, thread_data.output_obj was null.

vmount is automatically started now when the param is set from rcS

This automatically selects the mount aux mixer if mount is enabled via
parameters. A user can customize this by adding a file
 etc/mixers/mount.aux.mix
to the SD card.

Because further down the mixer file is set as:
	set MIXER_AUX_FILE /etc/mixers/${MIXER_AUX}.aux.mix

changes added for SPI CS defines as requested for BMI055 driver integration (e.g. GPIO_SPI1_CS_PORTE_PIN15 for bmi055 gyro) to avoid double declaration of same chip select pin

format check

Avoid dropouts, we have enough RAM there.

This will upgrade systems to the new .ulog format used by http://logs.px4.io and supported by Flight Plot