Allow snake to be calculated for an FE_field which is not a coordinate field, say the radius of a tree branch in a tree mesh.
Allow snake to be calculated for an FE_field which is not a coordinate field,
say the radius of a tree branch in a tree mesh.


git-svn-id: 4705079bc6b8aadf675e3696f5c015a6aa4916e3@4338 3c1deb5b-d424-0410-962d-aba41a686d42

OpenCMISS/zinc,hsorby/zinc,hsorby/zinc,hsorby/zinc,OpenCMISS/zinc,OpenCMISS/zinc,OpenCMISS/zinc,hsorby/zinc