EZTurtle : cleanup and add some methods with right -arity
Interpreter : add variadic methods for EZTurtle graphics
runtime : add support for True, False boolean primitive identifiers
yinyang.n : support for the Chinese energy symbols Yin-Yang
ezhil.py : remove curses
ezhil_parser.py : add support for the unary operators
runtime.py : -
test : add unary op, and turtle yin-yang tests
unary op
2to3 converter and keep most of the changes;
replace print statement for print function
replace apply() by the list invocation syntax
pass the same testsuite - 48/4 p/f rate