Hi,
When trying to configure DWA local planner parameters, i've found that [parameters](http://wiki.ros.org/dwa_local_planner) **scaling_speed** and **max_scaling_factor** are never *really* used.
Both of these parameters are only(?) called in [ObstacleCostFunction::getScalingFactor](https://github.com/ros-planning/navigation/blob/5a6ad24cf1bbc8ac08c06ef258fdf0bbdb3f9789/base_local_planner/src/obstacle_cost_function.cpp#L76), but the return value (scale) who is called in [ObstacleCostFunction::footprintCost](https://github.com/ros-planning/navigation/blob/5a6ad24cf1bbc8ac08c06ef258fdf0bbdb3f9789/base_local_planner/src/obstacle_cost_function.cpp#L86) is never used in the [footprintCost](https://github.com/ros-planning/navigation/blob/5a6ad24cf1bbc8ac08c06ef258fdf0bbdb3f9789/base_local_planner/src/obstacle_cost_function.cpp#L116) method.
Is that normal?
Thanks,
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