Merge upstream libdivecomputer changes from Jef Driesen.
The most notable one is how libdivecomputer no longer sends the
GASCHANGE events, but uses DC_SAMPLE_GASMIX instead.
We still turn it into a SAMPLE_EVENT_GASCHANGE2 event internally in
subsurface, since we want all the normal event handling to trigger.
* 'master' of git://git.libdivecomputer.org/libdivecomputer: (21 commits)
Document the date/time functions
Document the public api with man pages
Add support for the Cressi Drake
Detect overwritten dive profiles
Ignore tank pressure if no sensor is attached
Add support for the tank field
Add support for the salinity field
Use the sample interval from the settings
Update the Aqualung i750TC parser
Toggle the DTR line during setup
Implement the read function
Add doxygen documentation to the build system
Add support for the Aqualung i750TC
Fix the Windows version resource build
Force the dive mode to gauge
Add support for the dive mode
Report the initial gas mix on the first sample
Remove the deprecated gas change events
Add support for the Hollis DG02.
Add support for the Oceanic F10.
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