Octave: ignore test suite generated files
Octave: turn on autodoc in examples, so that feature is tested
Octave: further whitespace/indentation/style cleanup of octave.cxx

- Used "astyle -A10 -s2 -N -p -H -U -k1" for style cleanup
- Replaced NewString("") with NewStringEmpty()
- Used 'w' instead of 'f' for Wrapper() objects