fill_circle() is an alias for disk().  fill_rectangle() is an alias for sheet.  Introducing fill_polygon() and fill_regular_polygon(). clear_canvas() clears the printed text.  Introducing internal alias of random(): _random(), for minification purposes.  random(‘color’) is enhanced to return random colors of the following shades: red, green, blue, yellow, violet, teal.
Adding random('gray') and rewriting some comments.  Otherwise insignificant code changes.
loop() multi-character variable bug.
Local storage.  Major refactoring of the code.  Too much to list.
Minor code refactoring.  Moving $() to inbrowser.js and standalone.js
RUN/EDIT button.  File name field sizing bug.  Minor comment modifications.
Moving $() from owlscript.js.  Minor code refactoring.