Allow to scale the root bone ignoring the inherit scale option

Disabling scale inheritance in the bone property can be very useful, but when you later want to scale up or down the entire setup, it can be tedious to have to re-select and modify the scale of bones that have inheritance disabled. For example, after creating an adult skeleton, you may want to divert the same structure to create a child's skeleton. This is particularly hard for skeletons with complex structures. To avoid this, it would be useful to have an option to ignore inheritance and scale or some other setting.

Related post:
http://esotericsoftware.com/forum/My-comments-after-3-months-of-using-Spine-17668