add test script

aimed at checking if the quality of the images drops quickly or not

test/OCRmyPDF_severaltimes.sh

@@ -0,0 +1,15 @@
+#!/bin/sh
+#
+# Perform OCR several times in order to find how quicly the quality decreases
+
+cpt=1
+
+while [ $cpt -le 10 ] ; do
+
+	echo "------- Itteration $cpt ---------"
+
+	! ../OCRmyPDF.sh -vv -l deu -k ../tmp/ocred-$(($cpt-1)).pdf ../tmp/ocred-$cpt.pdf && exit 1
+	
+	cpt=$(($cpt+1))
+	
+done