Patch to remove Kluwer from Additional.lyx

[Pavel Sanda]

On Tue, Dec 06, 2022 at 10:31:51PM +0100, Jean-Marc Lasgouttes wrote:
> Shall we remove the layout file? It will make old files unreadable. It would
> be nice to have it in some attic, but I am not sure how to do it right.

I was also thinking about some attic. It would be read if necessary, but
it would not show in .po files and we do not want to show Kluwer in
Document Settings->D. Class either.

It seems some coding is necessary to get it right.
ATM we should perhaps just delete the template and somehow tag
layout for attic movement.

Pavel