Commits on Feb 6, 2019

1. Ensure the graphviz filenames are reproducible. …

   Whilst working on the Reproducible Builds effort [0], we noticed
   that sphinx could generate output that is not reproducible.
   
   In particular, the graphviz extension module would construct
   filenames based on, inter alia, the contents of the `options`
   dictionary.
   
   As this contained the absolute build path of the source file
   embedded in the `docname` variable this meant that builds of
   documentation were not independent of where on a filesystem they
   were built from.
   
   Example filenames might be:
   
     -  html/_images/graphviz-9e71e0f9ba91d0842b51211b676ec4adb7e7afb8.png
     +  html/_images/graphviz-6241bbfd7ac6bd4e2ad9af451ab0dfb8719988d2.png
   
   We fix this by limiting how much of the `docname` variable ends up
   in the final constructed filename; I assume there is a good reason
   for including the `options` dictionary in the first place, otherwise
   we could simply omit it.
   
     [0] https://reproducible-builds.org

   

   lamby committed Feb 6, 2019
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