Several hatching improvements#7421

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NelleV merged 5 commits intomatplotlib:v2.xfrom

QuLogic:hatch-dpi-density

Nov 14, 2016

Commits on Nov 9, 2016

Generate rasterized hatching at correct DPI.
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Fix misnamed things in PDF backend.
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Fix hatching with no edges in PS backend.
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Make PDF and PS hatching origin the same as Agg's.
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Fill hatches on PDF and PS backends.
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