add ref_height and default_com_height
Created by: pFernbach
Add two new members in Robot class :
- In rbprmBuilder :
ref_height
default root z value, with floor at z=0 - In fullBody :
DEFAULT_COM_HEIGHT
z value of the com position in reference configuration, with floor at z=0
Other changes :
- Slightly change the rleg_rom height to be symetric with the left one
- Reduce the max distance between the feet in the 'relative_constraints' : from 0.35 to 0.32
- referenceConfig_elbowsUp : lift more the arms and turn them toward the torso