* Refactor TrajectorySample::pos, vel, acc to value, derivative, second_derivative

* [Tests] update tests to refactor of TrajectorySample

* Task-am-equality: correctly use reference value/derivative instead of derivative/second_derivative
Fix #77

* [Python] update python bindings of TrajectorySample

* [Python] deprecate TrajectorySample.{pos,vel,acc}

* [Tests] python < 3.2 doesn't have assertWarns

* trajectory: keep deprecated pos/vel/acc, add updated getters / setters instead

* [CMake] install macros.hpp

Co-authored-by: Guilhem Saurel <guilhem.saurel@laas.fr>