Add far_tutorial_6 showing how to interpolate primvar data on the surface
limit at arbitrary locations.
Merge branch 'dev' of github.com:PixarAnimationStudios/OpenSubdiv into dev
Minor code cleanup / typo fixes in Far::PatchTables
Merge branch 'dev' of github.com:PixarAnimationStudios/OpenSubdiv into dev
Merge branch 'dev' of github.com:PixarAnimationStudios/OpenSubdiv into dev
Fixed issues with refined topology not correctly oriented around vertices:
    - Refinement methods to populate relations updated to order correctly
    - updated topology validation method in Level