In the information tab, presenting atmospheric pressure is a bit
unintuitive because the diver cannot easily relate that to altitude.
For the Atm. Pressure widget in the Information tab this code does:
If the atmospheric pressure for a dive exists and the user selects
the 'm' or 'ft' option from the combobox, then the estimated altitude
is shown in the text box.
Signed-off-by: willemferguson <willemferguson@zoology.up.ac.za>
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