PLCgen: 'current location of automaton' text in model overview is confusing

Currently, PLCgen generates a model overview in the generated code. Something like this:

    (*------------------------------------------------------
     * Model overview:
     *
     * ----
     * Automaton "hw_button":
     *
     * - Current location of automaton "hw_button".
     * - Input variable "hw_button.bat".
     * - Input variable "hw_button.bit".
     * - Input variable "hw_button.bot".
     * - Discrete variable "hw_button.r".
...

The 'Current location of automaton' was found to be confusing by users. They read it as only the current location being considered, stored, or whatever. It is not super clear what the model overview is to begin with. But they think that only the current location is part of the code, rather than all of them, or so. Or they just don't understand it.

We're reconsidering this model overview to begin with in #1022 (closed), but if we end up keeping it in some form, we should rethink this part in particular.

Addresses #679