prev: add a test case which shows traceback when doing prev on obsolete cset This patch adds a test which shows how `hg prev` is borken when called from a obsolete changeset and there is an active topic. The next patch will fix that.

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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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