In Lathe.js, updated blahRepl to provide arrow-key navigation of the command history.
In Lathe.js, tweaked blahRepl's command history navigation.
Made the preview work properly in all browsers I have handy.
In Lathe.js, listed the browser versions we've used to test setFrameSrcdoc().
Updated JSZip.
Tweaked the DataHtml format to make most at signs (@) exempt from escaping. Now it's more dedicated to excaping the specific sequences </ and <! .