GoSuB Browser Progress, pt15

It seems that something "dropped" (or snapped) when it comes to the borrow checker of Rust. I think I actually get it now, and somehow I get less issues and/or know how to resolve them. Seems like I'm still able to learn new tricks after all!

Right now I'm trying to get all the tests from tree-constructor/test1.dat running. There are still issues with the many different functions in the code. I will be here for a while...