Various docstring and commentary fixes, including
note of current maintainer. (fortran-mode): Use imenu-syntax-alist. (fortran-imenu-generic-expression): Use fortran-continuation-string, not always `+'. (fortran-font-lock-keywords-1): Include symbol syntax as well as word, following syntax table changes. (fortran-imenu-generic-expression): Likewise. (fortran-mode-map): Add a menu. (fortran-mode-version, fortran-startup-message): Delete misleading variables. (fortran-mode): Don't use them. (fortran-column-ruler-fixed, fortran-column-ruler-tab): Fix leading \ which made `0' into null. (fortran-join-lines): New function and key binding. (fortran-narrow-to-subprogram): New function and key binding. (fortran-mode-syntax-table): Make ?., ?_, ?$ symbol, not word.
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