[x3d-public] GeoPositionInterpolator revision for V4.0

[doug sanden]

Andreas,

> Alternatively, rather than introducing a new field it may suffice to
>  simply clarify in the appropriate spec. section that by default great
>  circle interpolation is recommended for consistency across geoSystems
>  and across browsers. This could be a recommendation  and not a
>  requirement but possibly with a qualifier that future spec. revisions
>  will actually require great circle interpolation.

Sounds good. 
-Doug
BSc Surveying Engineering