SNL: Have exodus reader produce multi-block dataset

This issue was created automatically from an original Mantis Issue. Further discussion may take place here.

We would like the exodus reader to be changed so that it produced a 'multi-block' dataset. I suppose one block per exodus 'block'. Also I should point out Bug #2590 - SNL: Have an 'Extract Parts' filter that works on Exodus data. Obviously these two issues are related.

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