mask, also avoid making vertex groups if they will not be filled. * Add back image pin option in image editor header. * Fix deep shadow not respecting Cast Buffer Shadows option. * Tangent space normal map baking should work again now. * Fix a problem with particle duplis, due to own bugfix for #20350, the problem for that seems to be in dupliverts, not particles. * Fix external multires data link getting lost on exiting editmode. (commits 27776,27777,27830,27840,27841,27862 by Brecht from render25 branch)