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11e0882e8d
The "root nodes" of the graph are displayed in bold. My intent here was to bold just the public-API headers, e.g. <vector> and <experimental/coroutine> and <stdlib.h>, but not helper headers such as <__functional_base> and <__iterator/next.h>. However, the recent mass helper-header-ification has exposed defects in this logic: all the new helpers were ending up bolded! Fix this. Also, add <__undef_macros> to the list of headers we don't display by default (like <__config>); it's not interesting to see those edges. Also, add a sample `dot` command line to the `--help` text.