Rename convention

navipy/database/__init__.py

navipy/database/test.py

navipy/maths/coordinates.py

navipy/maths/test_euler.py

navipy/maths/test_quaternion.py

navipy/moving/agent.py

navipy/moving/test_agent.py

navipy/processing/test_OpticFlow.py

navipy/sensors/blendtest_renderer.py

navipy/sensors/blendtestyxz.py

navipy/sensors/renderer.py

navipy/trajectories/__init__.py

navipy/trajectories/random.py

navipy/trajectories/test_trajectory.py

orientation/examples/bumblebee_thorax_orientation.py

orientation/examples/two_markers.py

orientation/examples/yawpitchroll.py