This function plots a grid associated with the mapping between two paths. This will plot n*2-1 by m*2-1 nodes,
associated with each point and segment in each path. This gets quite substantial when the paths have more than a
handful of points (5-10), and is only really useful for display and debugging purposes. This is called by
CreateMap, which overlays costs over the map on its own.
The first path
The second path
Warning–do not use for anything but very small paths, as it will take a long time to draw and be uninterpretable.
Shane T. Mueller and Brandon Perelman
See Mueller et al., (2016). https://sites.google.com/a/mtu.edu/mapping/
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