New Rho-Bot .nav files for Rho-Bot 2.0+
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Versions 1.0 and 1.1 of the Rho-Bot used navigation cell sizes of 64 x 64 x 64.  Rho-Bot Version 2.0 uses navigation cell sizes of 32 x 32 x 32.  Also, other changes have occured to how the bot use the navigation array.  If you have previous version of the nav files, please discard them.  Otherwise, the bot will learn the map at a much slower pace.