Ajax trouble in Private Messages with bulk delete action

[imath]

1/ In the inbox or in the sent box of private messages, if i bulk delete messages and once done if i click again, the ajax request will be sent with the same data as the deleted messages are only hidden and the checkbox remains checked. So once deleted, i suggest to uncheck the checkbox to avoid "double deletion"

2/ If i use the search form, once the result is displayed, using the selectbox to check the read/unread/all message will have no effect, same for the link to bulk delete the messages.

So i suggest the diff attached to solve the 2 bugs

[boonebgorges]

In 7411:

Improve JS for "Select" dropdown on messages screens

• Use jQuery delegation, to ensure that items added to the DOM dynamically (as in an AJAX search query) are listening for clicks
• Simplify logic

See #5070

Props imath

[boonebgorges]

In 7412:

Use delegation for bulk message actions.

This ensures that items added after AJAX actions are available for AJAX
deletion.

See #5070

Props imath

[boonebgorges]

In 7413:

Uncheck message checkbox in interface after deletion

The deletion UX only hides the message - doesn't remove it from the DOM - so
we have to make sure it's unchecked, or it'll mess up the next request.

See #5070

Props imath

[boonebgorges]

In 7415:

Remove element selectors from bp-default

Fixes #5070

Props imath