Output EDGE to exodus as BAR

[roystgnr]

"EDGE" isn't actually in the ExodusII standard, as far as I can tell, despite Paraview and even exodiff seemingly supporting it. But apparently Python meshio is stricter, so we should be more standards-conforming here.

Thanks to Adriaan Riet (@ke7kto) for catching this.

[roystgnr]

Well, that's fun Civet reporting:

Failed to save output:
A string literal cannot contain NUL (0x00) characters.

I'll see if I can reproduce.

[moosebuild]

Job Coverage on 72142fb wanted to post the following:

Coverage

	3c09b8	#3963 72142f
	Total	Total	+/-	New
Rate	62.17%	62.17%	-	100.00%
Hits	72415	72415	-	3
Misses	44060	44060	-	0

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