ANSimMobility: added getMaxSpeed().
{Circle, Linear, Mass, Rectangle, Stationary}Mobility: added getMaxSpeed().
MoBANMobility: added getMaxSpeed().
Ns2MotionMobility: added getMaxSpeed().
{Chiang, ConstSpeed, GaussMarkov}Mobility: added getMaxSpeed().
{RandomWP, Tractor}Mobility: added getMaxSpeed().
TurtleMobility: added getMaxSpeed().
BonnMotionMobility: added getMaxSpeed().
GridNeigborCache: x