Remove the code that forces hiding of O2 sensor readings despite the
sensors being reported as properly calibrated by the divecomputer.
This fixes the problem of no sensor readings showing on DiveCAN
controllers due to the fact that the sensor calibration values are
returned as defaults on these devices.
Also increase the timeout for data reads - this seems to improve the
reliability when reading logs of long dives.

Signed-off-by: Michael Keller <github@ike.ch>

Add the calibration values for ppO2 sonsors in CCR mode as extra info
fields.

Signed-off-by: Michael Keller <github@ike.ch>