test: remove deprecated files

unittest/finite-differences.cpp

@@ -5,7 +5,6 @@
 #include "pinocchio/multibody/model.hpp"
 #include "pinocchio/multibody/data.hpp"
 #include "pinocchio/parsers/sample-models.hpp"
-#include "pinocchio/algorithm/finite-differences.hpp"
 #include "pinocchio/algorithm/joint-configuration.hpp"
 #include "pinocchio/algorithm/kinematics.hpp"
 #include "pinocchio/algorithm/jacobian.hpp"

unittest/frames.cpp

-              //
+//
 // Copyright (c) 2016-2018 CNRS
 //