scanner.py : add support for != and ! tokens
runtime.py, Interpreter.py: add support for Boolean operators
test : count a extra negative test - by design boolean.n -
scanner.py : add support for != and ! tokens
runtime.py, Interpreter.py: add support for Boolean operators
test : count a extra negative test - by design boolean.n -
EZTurtle : add few more color line functions
Interpreter : add pause() and sleep() methods
yinyang.n : use pause,
chaos.n : demo using graphics
add graphics test chaos.n