Moved legacy code into archive, ready for a new rapid(?) prototype.

I may regret doing this!

unit-tests/empty-string.sh

@@ -1,13 +0,0 @@
-#!/bin/bash
-
-expected="\"\""
-actual=`echo '""' | target/psse 2>/dev/null | tail -1`
-
-if [ "$expected" = "$actual" ]
-then
-    echo "OK"
-    exit 0
-else
-    echo "Fail: expected '$expected', got '$actual'"
-    exit 1
-fi