case, otherwise, and endswitch.
(octave-begin-keywords): Add switch.
(octave-else-keywords): Add case and otherwise.
(octave-end-keywords): Add endswitch.
(octave-block-match-alist): Add an entry for switch syntax.
(calculate-octave-indent): Add support for switch syntax.
(octave-block-end-offset): New function.
(octave-comment-indent): Fix typo.