[PATCH] For CCR dives show O2 setpoint graph.

[Willem Ferguson]

Subject: [PATCH] Show the o2 setpoint graph

When a CCR dive is viewed and the toolbar button for PO2 is activated,
both the PO2 (green line) and the O2 setpoint (red line) are shown.
This allows evaluation of the PO2 in the CCR loop with respect to the
pre-configured O2 setpoint.

I need someone who is conversant with Qt to check this code, Please!

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

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