Made the data argument in Point's __init__method to be an optional argument by making it a boost::python::optional.
set (targets
ar-vineyard)
add_definitions (${cgal_cxxflags})
foreach (t ${targets})
add_executable (${t} ${t}.cpp ${external_sources})
target_link_libraries (${t} ${libraries} ${cgal_libraries}
${Boost_SIGNALS_LIBRARY}
${Boost_PROGRAM_OPTIONS_LIBRARY})
endforeach (t)