Accordion helper actions

[romancow]

It might be helpful to add a few buttons to accordion helpers to perform helpful actions. They could just be icon buttons with "hover" explanations. Also might want to be able to disable/remove them with ui options.

Some possible actions that might be useful:

• collapse all sub-accordions (ones contained within the one with the action)
• expand all sub-accordions
• collapse all non-required, expand required