* calc-ext.el (calc-init-extensions): Add keybinding for 'calc-option'.
Add `calc-option-prefix-help' to calc-help autoloads. (calc-inverse): Add "Option" to message, as appropriate. (calc-hyperbolic): Add "Option" to message, as appropriate. (calc-option, calc-is-option): New functions. * calc-help.el (calc-full-help): Add `calc-option-help'. (calc-option-prefix-help): New function. * calc-misc.el (calc-help): Add "Option" entry. * calc.el (calc-local-var-list): Add `calc-option-flag'. (calc-option-flag): New variable. (calc-do): Set `calc-option-flag to nil. (calc-set-mode-line): Add "Opt " as appropriate.
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