[WIP] Implementation of absorbing boundary layer#129

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cjvogl wants to merge 7 commits intoclawpack:masterfrom

cjvogl:absorbing_layer

Commits on Jul 7, 2018

Added abldata to data.py and made necessary ABL modifications to clawdata object
cjvogl
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Generalized some of the data.py modifications to N dimensions
cjvogl
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Commits on Jul 9, 2018

removed unused abl item in data.py
cjvogl
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Commits on Jul 29, 2018

Needed to update data.py to call gauge's write function to account for ABL
cjvogl
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Commits on Aug 8, 2018

Merge branch 'master' into absorbing_layer
cjvogl
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Commits on Feb 14, 2019

updates for use of both g(z) and g'(z)
cjvogl
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Commits on Feb 15, 2019

removed aux_num increase if abl is specified
cjvogl
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