Bug 20033: Switch single-column templates to Bootstrap grid: Catalog

Bug 20033: Switch single-column templates to Bootstrap grid: Catalog

This patch updates a few catalog-related single-column templates to use
the Bootstrap grid.

- basket/basket.tt - The staff client cart. Add some items to the cart
  and open the cart.

- catalogue/advsearch.tt - The advanced search page.

- catalogue/itemsearch.tt - The item search page, both the initial form
  and the search results.

Signed-off-by: Claire Gravely <claire.gravely@bsz-bw.de>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>