[PATCH] Repair minor bug in CCR setpoint graph

[Willem Ferguson]

Correct minor malfunction with CCR setpoint display. It
  was showing even when the po2 display was turned off. This patch 
ensures that
  the setpoint graph only shows when the po2 toolbar button is activated 
(and
  in addition the appropriate checkbox in the Preferences).

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

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