Let Rfd::Window know its own size and location
Array of Windows => Curses::Pad

Thank you @drbrain for the advice and the implementation! https://twitter.com/drbrain/status/389561006067695617
No need to ord a number
Use box for drawing borders

because borders were broken :ghost: under some terminals
DRY
waddstr => window.addstr
Extract window.clrtoeol from waddstr
waddstr => window.addstr
ls after refresh