Format 2013/dlowe, new script, rename others etc.

The demo.sh was renamed try.sh to be like the other entries.

The new script diff.sh runs some commands that I had previously added
(to demonstrate the entry) but which would be better in a script.

Renamed sflen.sh (for sparkline file length) to be slflen.sh (for
sparkline file length also).

Updated bugs.md - added more features that the author noted.

Format/typo check README.md file.

This should complete the review of 2013/dlowe.

2013/dlowe/try.sh

@@ -0,0 +1,34 @@
+#!/usr/bin/env bash
+#
+# try.sh - demonstrate IOCCC winner 2013/dlowe
+#
+
+# make sure CC is set so that when we do make CC="$CC" it isn't empty. Doing it
+# this way allows us to have the user specify a different compiler in an easy
+# way.
+if [[ -z "$CC" ]]; then
+    CC="cc"
+fi
+
+make CC="$CC" all >/dev/null || exit 1
+
+# clear screen after compilation so that only the entry is shown
+clear
+
+echo "$ ./dlowe 0 1 2 3 4 5 6 7"
+./dlowe 0 1 2 3 4 5 6 7
+echo
+echo "$ ./dlowe 16 32 64 128"
+./dlowe 16 32 64 128
+echo
+echo "$ ./dlowe 16 32 64 128 256"
+./dlowe 16 32 64 128 256
+echo
+echo "$ ./dlowe 16 32 64 128 256 512"
+./dlowe 16 32 64 128 256 512
+echo
+echo "$ ./dlowe 0"
+./dlowe 0
+echo
+echo "$ ./slflen.sh"
+./slflen.sh