This allows us to use non-C member variables. Convert a number
of pointers to unique_ptr<>s.
Code in uemis-downloader.cpp had to be refactored, because
it mixed owning and non-owning pointers. Mad.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This adds a test for the bug just fixed, where we have a trimix gas and
nitrox/air with less o2 than the trimix.
Signed-off-by: Anton Lundin <glance@ac2.se>
