Made the data argument in Point's __init__method to be an optional argument by making it a boost::python::optional.
set (targets
avida-distance
avida-rips-distance
#avida-landscape
)
foreach (t ${targets})
add_executable (${t} ${t}.cpp)
target_link_libraries (${t} ${libraries} ${Boost_PROGRAM_OPTIONS_LIBRARY})
endforeach (t ${targets})