work in steering behaviors
work in mobility
- add velocity vector vizu
- tests in steering behaviors
 restore steegin behaviors containement
 work in mobility and steering beahviors
modif in rays
add MOCAP Layout with origin
short propath
solve some issues in mobility
work on energy detection
fix update from orign master
Merge branch 'master' of github.com:pylayers/pylayers into mobility

Conflicts:
	pylayers/mobility/transit/SteeringBehavior.py
Merge branch 'mobility'
fixing bug in bsignal psd
modif in DF
modif in bsignal
Merge branch 'master' of github.com:pylayers/pylayers
Improve noise class in bsignal
modif in notebooks
Body:
- Trajectroy can be passed to Body__init__
- Body.dpdf create a dataframe with all device position along the Body.traj
- Body.getdevp(dev) : get a device position
- Body.getdevT(dev) : get a device orientation

Trajectory
- minot bug fix
Merge branch 'master' of github.com:pylayers/pylayers