Bug 21588: Add expand/collapse all links to the "Acquisition details" subscriptions

Bug 21588: Add expand/collapse all links to the "Acquisition details" subscriptions

In order to make the view cleaner, a librarian may need to expand or
collapse all the orders at once.

Test plan:
- Create a subscription
- Create several orders from this subscription (quantity > 1)
- Receive partially the orders
- Go to the subscription detail page, "Acquisition details" tab
=> Notice the 2 new links "Expand all" and "Collapse all"
Make sure they work as expected.

Also note that a bug has been fixed, when the page is loaded the tree is
now expanded.

Signed-off-by: Liz Rea <wizzyrea@gmail.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>