The public api is changed to require a context object for all
operations. Because other library objects store the context pointer
internally, only the constructor functions need an explicit context
object as a parameter.
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.
Sometimes there are a few garbages bytes received before the preamble
bytes. This typically happens when trying to download again after a
failed attempt. However trying to flush them immediately after opening
the serial port doesn't work.
When the OSTC receives the download dives command, it responds
immediately with the preamble bytes. But then it does a linear search
through its internal memory to locate the end-of-profile marker. As a
result the response time increases when the marker is located near the
end of the memory area. In the worst case scenario, the response time
can exceed the 3 second read timeout with a few milliseconds.
Since the required timeout depends on the total amount of profile
memory, this problem was indirectly introduced with firmware v1.91,
which doubled the amount of profile memory from 32K to 64K.
