Missing function definitions in process_h36m.py

[Mirandl]

Hi! Thanks for your working!

Here I find some wrong function which do not have any definition, I can't find these definitions elsewhere either.
such as get_ordered_action_names, interpolated_traj_new and cam_mapping
cause I need to preprocess the Human3.6m datasets with this file.

I would be verrrrrrrrrrry appreciate it if you could improve it. Thank you so much!