Make `Rajagopal` muscles more physiological

[mrrezaie]

Hi, according to this note:

The addition of damping reduces simulation time while allowing the muscle model to be more physiological (it can have an activation of zero, its active-force-length curve can go to zero, and its force-velocity curve can be asymptotic).

since the Millard2012EquilibriumMuscle with damping element (fiber_damping = 0.1) was employed in Rajagopal2016.osim model:

1. the min_control and minimum_activation can be set to zero
2. the min_norm_active_fiber_length and max_norm_active_fiber_length (0.25 and 1.9, respectively) can be set to their default range

As the note says, these changes would help physiologically based musculoskeletal modeling. However, this may have negative impact on performance (CMC took a bit longer). Thank you.