Adding the "dc_" namespace prefix (which is of course an abbreviation
for libdivecomputer) should avoid conflicts with other libraries. For
the time being, only the high-level device and parser layers are
changed.
The public header files are moved to a new subdirectory, to separate
the definition of the public interface from the actual implementation.
Using an identical directory layout as the final installation has the
advantage that the example code can be build outside the project tree
without any modifications to the #include statements.
When the dive mode setting is set to air, the oxygen percentage stored
in the header is different from the expected 21%. It might be the last
used nitrox percentage.
The total memory size is hardcoded again because the protocol does not
allow to retrieve the correct memory layout in advance. As long as there
is no device with a different amount of memory, that should be fine.
