A function to determine graphviz library version
This function will query the graphviz libraries that the package was built against and report what version of Graphviz is being used.
A list with three elements, two of class
numeric_version. The first element named
installed_versionrepresents the version of Graphviz that is being used by the package. The second element named
build_versionrepresents the version of Graphviz that was used to build the package. A mismatch between these two versions may indicate problems. The third element is a logical named
bundled_graphvizand indicates if Rgraphviz is using the bundled Graphviz (default) or an external Graphviz.
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