[Pyzo] Run menu confusion + suggestion

[l***@gmail.com]

The Run menu items will at first be a little confusing to most users.

There are items like
* Run file
and
* Execute file

But the getting started help text refers instead to:
* Interactive mode
vs
* Running in restarted shell

So the connection between run/execute menu selections and
interactive/restarted shell modes is not exactly clear.
Evidently the "as script" phrase is used to signal the difference, but that
phrase rather adds to the confusion since any python code is called script
code.

Likewise, some users may wonder how "MAIN file" is connected to "if 1 and
__name__=='__main__':", so to avoid that confusion as well it might be
better to use "starred file" instead of "main file".

--- Suggestion for self-explaining menu items:

* Run current file in restarted shell
* Run starred file in restarted shell

* Execute selection in interactive shell
* Execute cell in interactive shell
* Execute current file in interactive shell
* Execute starred file in interactive shell

(also in the tab / right click pull down)