(fortran-comment-line-start): Define as

(fortran-comment-line-start): Define as
"C".
(fortran-comment-line-start-skip): Don't match cpp stuff.
(font-lock-keywords): Add * to comment-chars.  Grok cpp stuff.
(fortran-mode-map): Remove over-eager custom-menu-create for now.
(fortran-mode): Don't set fortran-comment-line-start-skip,
fortran-comment-line-start here.  Set comment-start,
add-log-current-defun.
(fortran-fill-paragraph): Adjust to try to DTRT with cpp stuff.
(fortran-current-defun): New function.