Free42 with big stack, test version

[Werner]

I was trying out a few pieces of code, to see how they would look, implemented with (L)NSTK.
In one instance, I only switched to NSTK mode when necessary, so switching between NSTK and 4STK modes would be useful, for me ;-)
(it's actually not so easy, finding examples that benefit from NSTK. Here I am, making do with 4 levels all my life. All my programs make maximum use of the stack, and it's surprising what you can do with just 4 levels ;-)
Werner