Undo some broken CCR features

[Willem Ferguson]

Undo some features that were broken in Robert's patch 0d7c192e:

1) Calculate correct partial pressure of oxygen to be plotted on
    dive profile, taking into account the oxygen sensor data.
    Currently, erroneously, OC PO2 values are shown, due to an
    erroneous calling parameter to fill_pressures().
2) Read start and end cylinder pressured correctly. In Robert's
    patch, some wrong assignments were done in file.c. This is
    now corrected and the correct cylinder pressures are shown in
    the equipment tab.
3) Write correct cylinder pressures to XML. Currently the data for
    the two cylinder are written to XML the wrong way round
   (diluent pressures = oxygen and vice versa).

Expand XML output:
1) Write oxygen sensor data to XML
2) Write no_of_02sensors to XML

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

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