Fixed low-res photos getting re-created every run.

It was missing a touch to the lastrun file in case of success. Now added.

chertex.sh

@@ -160,6 +160,9 @@ if [ $# -eq 1 ]; then
          echo "<thesis> Shrinking $largephotobasename.jpg"
          convert $largephotoname.jpg -define jpeg:extent=300kb $largephotoname.jpg
       done
+      # update the modification and access time on the photosastrun file
+      touch "$photoslastrun"
+
    fi
    # short delay to enable on-screen reading of previous echo
 	simpledelay.sh 2