fix(modflowpy#615): plotutil mask hnoflo and hdry#618

Merged

christianlangevin merged 1 commit intomodflowpy:developfrom jlarsen-usgs:develop

Jul 22, 2019

+16-1

Commits on Jul 18, 2019

fix(#615 ): plotutil masked_values hnoflo, hdry fix
jlarsen-usgs
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