Bug 30436: Convert article requests tabs to Bootstrap

Bug 30436: Convert article requests tabs to Bootstrap

This patch converts the jQuery tabs on the article requests page to
Bootstrap.

To test you should have the "ArticleRequests" system preference
enabled. If necessary, create some article requests and mark some
"Pending," some "Processing," and leave some new.

- Apply the patch and go to Circulation -> Article requests.
- The page should show three tabs: New, Pending, and Processing.
- The tabs should look correct and work correctly.
- The DataTables under each tab should work correctly.

Signed-off-by: Séverine QUEUNE <severine.queune@bulac.fr>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>