* Add a linkmap plugin (requires graphviz).

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diff --git a/doc/plugins/linkmap.mdwn b/doc/plugins/linkmap.mdwn
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+[[template id=plugin name=linkmap included=1 author="Joey Hess"]]
+[[tag type/meta]]
+[[tag type/slow]]
+the mapped pages is changed, which can make the wiki a bit slow.
+This plugin uses graphviz to generate a graph showing the links between a
+set of pages in the wiki. Example usage:
+
+	\[[linkmap pages="* and !blog/* and !*/Discussion"]]
+
+Only links between mapped pages will be shown; links pointing to or from
+unmapped pages will be omitted. If the pages to include are not specified,
+the links between all pages (and other files) in the wiki are mapped. For
+best results, only a small set of pages should be mapped, since otherwise
+the map can become very large, unweildy, and complicated. Also, the map is
+rebuilt whenever one of the mapped pages is changed, which can make the
+wiki a bit slow.
+
+This plugin is included in ikiwiki, but is not enabled by default.
+
+If this plugin is enabled, here is a link map of the index page and all
+pages it links to:
+
+[[linkmap pages="index or (backlink(index) and !*.png)"]]