Finalising images (source-academy#578)

* Finalizing all images

* Finalizing all images EXCEPT:

2.9-2.12, 2.14

* Fixing Martin's spotted errors

* Ellipses

Author: TobiasWrigstad

scripts/fix-gray.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+rm -f /tmp/file.pdf 
+mv $1 /tmp/file.pdf
+gs \
+ -sOutputFile=$1 \
+ -sDEVICE=pdfwrite \
+ -sColorConversionStrategy=Gray \
+ -dProcessColorModel=/DeviceGray \
+ -dCompatibilityLevel=1.4 \
+ -dNOPAUSE \
+ -dBATCH \
+ /tmp/file.pdf