doc/ref/hierarchy.png: conform to hierarchy.txt and manual

hierarchy.png (and .pdf, .eps) were changed to add one node
to the graph, getting them in sync with hierarchy.txt
(and the GOOPS section of the manual).

Also added hierarchy.dot, a file to generate said figure
using graphviz.

4 files changed, 619 insertions, 124 deletions

diff --git a/doc/ref/hierarchy.dot b/doc/ref/hierarchy.dot
new file mode 100644
index 000000000..f0d9daf8e
--- /dev/null
+++ b/doc/ref/hierarchy.dot
@@ -0,0 +1,21 @@
+/*
+ * Process this file with graphviz to produce hierarchy.[png,eps]
+ * e.g. dot hierarchy.dot -Tpng > hierarchy.png
+ */
+digraph hierarchy {
+	graph [rankdir="BT"];
+	node  [shape="none"];
+	F -> D
+	F -> E
+	D -> A
+	E -> A
+	D -> B
+	E -> C
+	A -> "<object>"
+	B -> "<object>"
+	C -> "<object>"
+	"<object>"    -> "<top>"
+	"<pair>"      -> "<top>"
+	"<procedure>" -> "<top>"
+	"<integer>"   -> "<real>" -> "<complex>" -> "<number>" -> "<top>"
+}
diff --git a/doc/ref/hierarchy.eps b/doc/ref/hierarchy.eps
index 7b1a98605..d9e896ccf 100644
--- a/doc/ref/hierarchy.eps
+++ b/doc/ref/hierarchy.eps
@@ -1,127 +1,601 @@
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-%%For: eg@kaolin (Erick Gallesio)
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+%%Creator: graphviz version 2.26.3 (20100126.1600)
+%%Title: hierarchy
+%%Pages: (atend)
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diff --git a/doc/ref/hierarchy.pdf b/doc/ref/hierarchy.pdf
index 3a19ba4eb..8c02d7a56 100644
--- a/doc/ref/hierarchy.pdf
+++ b/doc/ref/hierarchy.pdf
diff --git a/doc/ref/hierarchy.png b/doc/ref/hierarchy.png
index 46f58b051..e3a516164 100644
--- a/doc/ref/hierarchy.png
+++ b/doc/ref/hierarchy.png