Sorted out some interesting buglets in read and print (although there is

still one I know of). More unit tests, and all pass. Not evalling yet.

Good day's work.

unit-tests/quoted-list.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+expected='(quote (123 (4 (5 nil)) Fred))'
+actual=`echo "'(123 (4 (5 ())) Fred)" | target/psse 2> /dev/null`
+
+if [ "${expected}" = "${actual}" ]
+then
+    echo "OK"
+    exit 0
+else
+    echo "Fail: expected '${expected}', got '${actual}'"
+    exit 1
+fi