[PATCH] Visualisation of individual oxygen sensor data for CCR dives

[Willem Ferguson]

This patch implements the visualisation of the oxygen sensor data for CCR
dives. The partial pressure measurements of each of the sensors are graphed
using the existing partial pressure axis in the dive profile widget. There
are now four separate sets of data that can be plotted using the partial
pressure axis system: po2, pn2, phe, and this additional one: sensor data.
The sensor data can be visualised individually or in combination with
any of the other three partial pressure graphs, mentioned above. The display
of the sensor data is activated by the button at the bottom of the toolbar,
allowing the evaluation of data from individual oxygen sensors with respect
to drift or fluctuation and with respect to the setpoint setting, these
being important criteria for evaluating the reliability of these sensors
for a particular set of CCR equipment. It is a feature that many
implementations of proprietary CCR dive logs have.

I need critical evaluation of this Qt code, please!!

Signed-off-by: willem ferguson <willemferguson at zoology.up.ac.za>
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