tl2020 pretest begin

[Karl Berry]

    db>     `tlmgr -gui &` then Actions œôöò Remove TeX Live 2020
    >     ...
    >     indeed, nothing has been uninstalled/removed.

    kb> I hope someone else can look at the GUI code. Sounds like it's not
    > invoking what needs to be invoked.

    Indeed. Who is maintaining it?

Ummm ... Norbert?

    BTW, I don't see the point of the `install-tl` script in the
    .../texlive/2020 directory once TL has been installed.

Users requested it (I don't remember who). It is possible to run
install-tl using the installed TL as the repository. (./install-tl -repo .)
--best, karl.