added runtime output of strings to console
	modified:   spec.md
abandoned string interpolation shortcuts.  Users can suffer a bit.
	modified:   spec.md
began fork for positron compiler

	new file:   MARK0-js/positron-compiler.js
	modified:   MARK0-js/positron-interpreter-naive.js
	modified:   MARK0-js/positron-interpreter-optimized.js
	modified:   MARK0-js/positron8x8.html