Re: exact inversion (issue4173065)

[tdanielsmusic]

The patch works fine, but the documentation could be improved.
Expanding the example in a different section to show \inversion is not
optimal.  We need an @lilypond{} immediately after the @example showing
the syntax in the Inversion section.

Also, with this addition, it would be sensible to take \retrograde out
of the Modal transformations section and place it in a section of its
own, like Inversion.

All this could be done in a separate patch I guess, so LGTM.


http://codereview.appspot.com/4173065/