[libdivecomputer] #6: Add support for parsing gas changes in the Oceanic backends

[Libdivecomputer Bug Tracking System]

#6: Add support for parsing gas changes in the Oceanic backends
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                                            Reporter:|      Owner:  jefdriesen
  jefdriesen                         |     Status:  new
                                                Type:|  Component:  Dive parsing
  enhancement                        |   Keywords:
                                            Priority:|
  major                              |
                                             Version:|
  master                             |
Plattform (please give specifics in  |
  the ticket text):  All             |
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 Currently, none of the Oceanic backends does support parsing the gas
 changes in the profile data.

 The first step will be to figure out how the gas changes are stored in the
 data. Most likely the tank switch sample is not only used to indicate the
 active tank pressure sensor, but also the active gas mix. How this works
 for non air integrated models is also unknown. Maybe there is a tank
 pressure of zero, or a disabled pressure sensor in this case?
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Ticket URL: <http://trac.libdivecomputer.org/ticket/6>
libdivecomputer <www.libdivecomputer.org>
a cross-platform and open source library for communication with dive computers from various manufacturers