[dev-context] \nonknuthmode breaks _ in protected mode

Hi Hans, the \nonknuthmode in core-def.mkiv breaks _ in modules: \starttext \the\catcode`\_ \unprotect \the\catcode`\_ \protect \the\catcode`\_ \stoptext It helps when you enable \nonknuthmode with \everystarttext (or \everyjob), e.g. \appendtoks \nonknuthmode \to \everystarttext Wolfgang