[Cl-yacc-ebnf-devel] Update

[Mikhail Novikov]

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Hello everybody!

It had quite a busy week, so I was not able to do anything to the project, now I finally found some time and did some updates. I've added ":or" command. It is mostly added for developer convenience as there is already a way to have "or" in cl-yacc, but I've added it so that all syntax is uniform. Last thing to add to make proper ebnf is "except".

Cheers, Mikhail

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