Clickover plugin not compatible with bootstrap 3

The [clickover](https://github.com/lecar-red/bootstrapx-clickover) plugin has not been updated in a year and is not compatible with bootstrap 3. (See, e.g. #3424)
Since share is now a modal, I don't think this specific scenario applies anymore. So I won't worry about it specifically. I do, however, see a similar behavior that I will investigate:

1. Select a content item in my library
2. Click the disclosure triangle on the (left) clip.
3. Click the notifications icon. The clip closes and the notifications appear as expected.
4. Close the notifications icon.
5. The clip can no longer be opened through the disclosure triangle.

At step 5, the console shows the following error:

```
[Error] TypeError: undefined is not an object (evaluating 'context.ownerDocument')
	contains (require-jquery.js, line 3606)
	(anonymous function) (bootstrap.popover.js, line 53)
	dispatch (require-jquery.js, line 6637)
	handle (require-jquery.js, line 6321)
```