Updated human and wii tool for human mocap

human class now call mocap_human when needed.
Human mapping for spark is finished

Note that spark was also updated to take 50 joints.
Update kinect calibration
[cmake] Compute PYTHONLIBS_VERSION_STRING only if patchlevel.h is found

Fix the weird cmake message error when PYTHON_INCLUDE_DIR is not found
for the desired python version.