Add doc from tra3dpy

doc/source/camera_3dtrajectory/cam_calibration.rst

doc/source/camera_3dtrajectory/cam_triangulation.rst

...rce/camera_3dtrajectory/examples/extrinsic_calibration.py

doc/source/camera_3dtrajectory/examples/manhattan.py

doc/source/camera_3dtrajectory/examples/manhattan2d.py

doc/source/camera_3dtrajectory/examples/manhattan_0001.hdf

...e/camera_3dtrajectory/examples/npairwise_triangulation.py

doc/source/camera_3dtrajectory/index.rst

doc/source/classification/examples/saccade_extraction.py

doc/source/classification/examples/saccade_loliplot.py

doc/source/classification/index.rst

doc/source/classification/sac_intersaccade.rst

doc/source/error_propagation/error_propagation.rst

...rror_propagation/examples/error_propagation_univariate.py

doc/source/index.rst

doc/source/media/marked_bumblebee.png

doc/source/orientation/Orientation_two_markers.rst

doc/source/orientation/bumblebee_orientation.rst

doc/source/orientation/examples/bumblebee_markers.py

...urce/orientation/examples/bumblebee_thorax_orientation.py