I've worked hard to check and fix the code that manage the flashing cursor on the screen. I did it because I noticed that when running a program in a non-direct mode (i.e. when the program didn't need inputs from the user), the cursor was always flashing on the screen.

I worked a lot and (hope I have) fixed it by checking the mode of working of the interpreter: now the cursor is on the screen only when in direct mode or when the program ask some input by the user (i.e. using the INPUT command). 

The new release is marked 2.1a.

I also added a new BASIC program, WA-TOR, a simulator of preys and predators in a fictional world. Enjoy it.