(fortran-mode-map): Don't bind M-C-a,

(fortran-mode-map): Don't bind M-C-a,
M-C-e, M-C-h, C-j, C-xnd, TAB.
(fortran-mode): Set beginning-of-defun, end-of-defun.
(fortran-column-ruler): Simplify.
(fortran-mark-subprogram, fortran-narrow-to-subprogram): Deleted.
(fortran-with-subprogram-narrowing): Likewise.
(fortran-indent-subprogram): Call mark-defun.
(fortran-check-for-matching-do): Change narrowing.