tests: add more verification of output to divergence tests It's not obvious what the obsmarkers should look like in these tests and adding them highlights a bug that happens when commit we create to resolve the divergence doesn't get created because it would be empty. I also added a few graphlog calls to check that the divergence-resolution commit is in the right place (has right parentage).

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mkdir -p html

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cp index.html html/

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cp *.css html/

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cp *.js html/

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cp -R img html/

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cp -R graphviz-images/ html/

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