Default values for initialisation of the agents
These are described in group-level terms,
to be translated to individual/agent values when
an agent is created
Calculates the transposition (the distance in moving given a certain velocity)
returns the distance in terms of simulation distance given a velocity in
real (m/s) terms
Physical space is related to a real physical space
1 grid cell / unit = 40x40cm (0.4x0.4m)
movement of 1 is 40cm in real
v [m/s] = [2.5 unit / s] // need to think how simulation time relates to real time