Don't require easymenu. Use repeat counts in various regexps.

Don't require easymenu.  Use repeat counts in various regexps.
(fortran-mode-syntax-table): Defvar directly.
(fortran-font-lock-keywords-1, fortran-font-lock-keywords-2)
(fortran-font-lock-keywords-3, fortran-font-lock-syntactic-keywords):
Use defvar, not defconst.
(fortran-mode-map): Change locals in `let'.  Use `fortran-auto-fill'.
(fortran-mode): Set fortran-comment-line-start-skip,
fortran-comment-line-start-skip, dabbrev-case-fold-search.
(fortran-comment-indent): Use defsubst.
(fortran-indent-comment, fortran-indent-to-column, fortran-break-line):
Use fortran-comment-indent, not fortran-comment-indent-function.
(fortran-comment-region, fortran-electric-line-number): Simplify.
(fortran-auto-fill): New function.
(fortran-do-auto-fill): Deleted.
(fortran-find-comment-start-skip): Check for non-null
comment-start-skip.
(fortran-auto-fill-mode, fortran-fill-statement): Use
fortran-auto-fill.
(fortran-fill): Use fortran-auto-fill.  Check for null
comment-start-skip.  Simplify final clause and use end-of-line finally.