ENH: If the material cell data can not be found, warnings are now emmitted on a material basis instead of on a per grid basis - see issue 3121.  Also began changing the code to use the new bounding box class.
ENH: If the material cell data can not be found, warnings are now emmitted on a material basis instead of on a per grid basis - see issue 3121.  Also began changing the code to use the new bounding box class.

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