I got animation retargetting working in Blender. Here, two examples of Mixamo animations (https://www.mixamo.com/) retargeted to P_HHF_skel.
I use the animation retargetting technique explained in this video: https://www.youtube.com/watch?v=2GSzn7qkE7Y
I have setup a Blender file (for version 2.79) that makes very easy to retarget a Mixamo animation to the skeleton P_HHF_skel:
If someone wants to try the Blender file, I’ll provide instructions.