The term "backend" can be confusing because it can refer to both the
virtual function table and the device/parser backends. The use of the
term "vtable" avoids this.
I forgot to update the device and parser initialization functions to
store the context pointer into the objects. As a result, the internal
context pointers were always NULL.
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 memory layout of the Suunto Eon and Vyper devices is very similar,
which allows to share the parsing code between the backends. Differences
in the layout are passed by means of a new layout descriptor structure
and a common base class is introduced to share the fingerprint data.
Memory buffers are now allocated dynamically to support devices with
different amounts of memory.
