Whitespace changes, some re-ordering of code, trivial commentary change.

Whitespace changes, some re-ordering of code, trivial commentary change.
(fortran, fortran-indent, fortran-comment)
(fortran-tab-mode-default, fortran-continuation-indent)
(fortran-comment-indent-style, fortran-blink-matching-if)
(fortran-continuation-string, fortran-electric-line-number)
(fortran-break-before-delimiters, fortran-mode-hook)
(fortran-end-prog-re, fortran-imenu-generic-expression): Minor doc changes.
(fortran-tab-mode-minor-mode-string): New variable.
(fortran-tab-mode-string): Now customization is meaningful.
(fortran-column-ruler-fixed, fortran-column-ruler-tab)
(fortran-analyze-depth): Use defcustom.
(fortran-if-start-re, fortran-end-prog-re1, fortran-fill)
(fortran-break-line, fortran-prepare-abbrev-list-buffer)
(fortran-auto-fill): Add doc string.
(fortran-type-types): New constant (was local to let binding).
(fortran-font-lock-keywords-1, fortran-font-lock-keywords-2)
(fortran-font-lock-syntactic-keywords): Initialize in defvar.
(fortran-font-lock-keywords-3): Initialize in defvar.  Use 1+ now
depth of fortran-type-types has changed.  Remove extra and.
(fortran-mode-menu): Minor re-organization.  Use lookup-key.
(fortran-mode): Doc changes.  Some re-organization.  Use
fortran-tab-mode-minor-mode-string.
(fortran-comment-indent): Add doc string.  Move save-excursion. Use 1+.
(fortran-indent-comment, fortran-fill-statement): Change interactive spec.
Use unless.
(fortran-comment-region): Doc change.  Reverse logic of arg test.  Use zerop.
(fortran-abbrev-start, fortran-split-line)
(fortran-electric-line-number, fortran-indent-subprogram)
(fortran-strip-sequence-nos): Change interactive spec.
(fortran-remove-continuation): Add doc string.  Use when.
(fortran-numerical-continuation-char): Doc change.  Use 1+.
(fortran-previous-statement, fortran-next-statement)
(fortran-beginning-do, fortran-calculate-indent)
(fortran-end-do, fortran-end-if, fortran-beginning-if): Use zerop, 1+, 1-.
(fortran-blink-match, fortran-check-for-matching-do): Use when.
(fortran-indent-line): Change interactive spec.  Remove un-needed if.
Use when.
(fortran-indent-to-column): Doc change.  Use when, unless.
(fortran-find-comment-start-skip): No longer interactive.
(fortran-analyze-file-format): Minor doc change.  Remove un-needed setq.
(minor-mode-alist): Use add-to-list.
(fortran-fill-paragraph): Change interactive spec, doc string.