[WIP] Implementation of absorbing boundary layer#225

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cjvogl:absorbing_layer

Commits on Jul 27, 2018

added absorbing layer source code and updated acoustics_2d_radial example to use ABL
cjvogl
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Needed to update data.py to append AMR aux variable information for ABL
cjvogl
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Propagated some plot formatting changes over from Classic acoustics_2d_radial example
cjvogl
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