TODO
====
o Move Reader.transpose to evaluator
o BINOP and UNARY function precedences (minus!)
o Load/Save Modal Dialog box
o Prototype chaining length problem
o Port some MSW functions that are simple to do
o Help Package
o Add Comments
o Add Button LayoutManager
o Add command line
o Make forward delay optional
	- Add Turtle Speed selector
o Zoom in/out
o Make turtle transparent?
o Revise Popup layouts
