Allow atomic propositions and identifiers like `X.Y'.
* src/ltlparse/ltlscan.ll: Do not recognize `.' as an AND. Allow it in atomic propositions. * src/evtgbaparse/evtgbascan.ll, src/tgbaparse/tgbascan.ll: Accept `.' in identifiers. * src/misc/bareword.cc (is_bareword): Accept `.' inside barewords, so that there is no need to quote `X.Y'. * src/ltltest/parse.test: Do not use `.' as and operator..
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