Rename the 'aux' subdirectory to avoid Windows restrictions.

James Harvey points out that Windows still forbids calling a file
'aux' in any context. Even a directory. Gaaah.

auxiliary/hatgen-images.sh

@@ -0,0 +1,23 @@
+#!/bin/sh
+
+# Regenerate all the SVG images in the aux/doc directory for hats.html
+# and hatmap.html.
+
+set -e
+
+hatgen=$1
+
+if ! test -x "$hatgen"; then
+    echo "Provide pathname to hatgen as an argument" >&2
+    exit 1
+fi
+
+for tile in H T P F; do
+    "$hatgen" "$tile" > single-"$tile".svg
+    "$hatgen" c"$tile" > expanded-"$tile".svg
+    "$hatgen" h"$tile" > hats-single-"$tile".svg
+    "$hatgen" H"$tile" > kitemap-"$tile".svg
+    "$hatgen" C"$tile" > metamap-"$tile".svg
+done
+
+"$hatgen" --hat > hat-kites.svg