[CCR PATCH] Calculate appropriate po2 values

[Willem Ferguson]

     Calculate appropriate O2 partial pressures for CCR dives

     Files affected: profile.h, profile.c

     This patch ensures an appropriate representation of oxygen partial 
pressures
     for CCR equipment with one or more oxygen partial pressure sensors. 
The
     calculated po2 is stored in the po2 variable of the plot_data 
structure. The
     following changes were made:
     1) In profile.h adapt plot_data with variables to accommodate the 
partial
        pressure values by creating fo2, o2sensor[3] and o2setpoint.
     2) In profile.c change function calculate_gas_information_new:
        a) Add a dc parameter in the function call.
        b) Perform PO2 calculations using the following rules:
           For 2 PO2 sensors, calculate the mean of the two and store in 
po2.
           For 3 sensors: diff_limit is the critical limit indicating 
large sensor
           difference (default = 100 mbar)
           a) If all three readings are within a range of diff_limit, 
then take the
              mean value. This includes the case where reading 1 is within
              diff_limit of reading 2; and reading 2 is within diff_limit of
              reading 3, but readings 1 and 3 differ by more than 
diff_limit.
           b) If one sensor differs by more than diff-limit from the 
other two,
              then take the mean if the closer two sensors and disregard 
the 3rd
              sensor, considered as an outlier.
           c) If all 3 sensors differ by more than diff_limit then take 
the mean
              of the 3 readings.

     Signed-off-by: Willem Ferguson <willemferguson at zoology.up.ac.za>


In terms of C code files this patch is independent of the previous CCR patch
(dealing with xml and git I/O) since this one only affects profile.c and 
profile.h
which were not involved in the previous patch.
However, in execution it is dependent on the initialisation if the dive data
structure (o2 sensor data) which is done in that patch.
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