Cleanup
Bake-API: shows the baked image in the biggest SpaceImage around (just like Blender Internal)

Reviewers: campbellbarton

Differential Revision: https://developer.blender.org/D544
Transfer shape keys wasn't checking for mesh types
Bake API: compare with NULL rather then casting to bool
Fix T40325: UILists do not save their height anymore
Another fix for T40230/T40290: Object tags were not properly initialized
before entering the recursion check.

Now use group tags instead of object tags, which could be a little more
efficient and was used before this patch too.
BMesh Walker: typecheck args for walker->begin()
BMesh Walker: rename BMW_SHELL -> BMW_VERT_SHELL
BMesh Walker: add face-shell walker
Fix T40324: Checker deselect fails for edge-rings
Checker Deselect: keep active item selected by default
Spelling fix
Fix T40325: Part II

Use same cursors for GRIP buttons as for window resize e.g.
Report to the console when custom ocio config is used