The old code was leaking memory. Use std::unique_ptr<> for
ownership management.
This is still very primitive and divetags are kept during
application lifetime. There should probably be some form
of reference counting. And the taglist should not be global,
but attached to the divelog.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
Since this is the only caller, onvert the get_file_name() function
to return an std::string.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
