[tlu] revision vs. catalogue-version

[Karl Berry]

Hi Adam - as you know, I don't use TLU, but ... Frank (Mittelbach)
mentioned that TLU shows the TL revision number (the integer) up front,
but that the catalogue-version string (that comes from the package) is
not shown and/or is harder to find.

Occasionally, we have to update the TL infrastructure files without the
actual package changing, which will bump the TL revision, so users
erroneously think something in the package has changed. This happened a
couple days ago with amsmath, when we installed the new
latex-amsmath-dev package.

Thus, maybe it would be helpful for TLU to show the catalogue-version
field also, so users can see it has not changed.  Admittedly the c-v
field is not 100% reliable either, but I think it's pretty good these
days. No perfect solution ... --thanks, karl.