ar-vinyeard compiles and runs: - ar-function-kernel uses int for sign rather than bool in sign_at - switched to dealing with a single functions themselves in value_at - order of thresholds is handled correctly in ar-vineyard (max is the last one)

set							(targets						
							 triangle)
							 
foreach 					(t ${targets})
	add_executable			(${t} ${t}.cpp)
	target_link_libraries	(${t} ${libraries})
endforeach 					(t ${targets})