Milestone Implement make subsample public

Subsample info should show whether it is public or private. Implement make subsample public by choosing the subsample. The interface should make it possible to choose chemical analyses associated with this subsample (all or a chosen subset) and make them public if desired. Similarly, the image map for the subsample should be made public if the user desires. For this to work, the user must be the owner of the subsample and the parent sample should be public.