[luatex] LuaTeX and XeTeX KpseOnly option and Extension

[Carlos]

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> even though somewhere along between the release of 2023 and shortly after, some more changes took shape reflecting I presume, the aformentioned issue to have such an option as KpseOny. And there we go! The whole story repeated itself again with changing certain parts of the document to accomodate whatever the modifications that took effect and were coming from the engines.
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> But I also remember that something happened. The Extension had to be thus, specified. Not so much as an option but also for every font or for the whole family such as {fontname.otf} or individually 
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> e.g one could have \setmainfont[whateveroption=font.extension]{font} or \setmainfont[whateveroption=font]{font.extension} 

Fe de errata here. 

e.g one could have \setmainfont[whatevervariant=font.extension]{font} or \setmainfont[whatevervariant=font]{font.extension} 
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> Now both XeTeX (v3.14) and LuaTeX (v1.18) only undertand the path of system fonts such as /usr/share/ and /usr/local/share or whatever the path happens to be to find them. There's no room to have any engine work successfully for a lookup under kpathsea or wherever the variable texmflocal points to. Nope. not such a thing.
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