(octave-looking-at-kw)
(octave-re-search-forward-kw, octave-re-search-backward-kw): New functions.
(octave-in-defun-p, calculate-octave-indent)
(octave-blink-matching-block-open, octave-beginning-of-defun)
(octave-auto-fill): Use octave-looking-at-kw instead of looking-at,
to search for regexps that contain case-sensitive keywords.
(octave-beginning-of-defun): Likewise, for octave-re-search-backward-kw.
(octave-scan-blocks): Likewise, for octave-re-search-forward-kw.