bug#17955: 24.3.92; octave.el: indentation following ... or \

[Leo Liu]

As reported on 2013-07-03 in
http://article.gmane.org/gmane.comp.gnu.octave.maintainers/33796

In octave mode:

a = \
b

b is aligned to a. Previously there was an offset per
octave-continuation-offset.

The octave smie lexer may or may not return the continuation token (...
or \), any idea why it is made to behave like this?
octave-continuation-offset is also unused. Comments?

Leo