Bug 11430 [Follow-up] Search history: Delete selected lines

Bug 11430 [Follow-up] Search history: Delete selected lines

This follow-up for Bug 11430 makes some changes to the template to make
it more useful when JavaScript is turned off:

- Hide the toolbar containing select all/clear all links if JS is off
- Add buttons to submit the forms if the delete link in the toolbar is
  unavailable (or if the user has scrolled all the way to the bottom of
  a long list)

Also changed: Corrected indentation from 2-space to 4-space, added
comments to the markup to help document page structure; changed the
class of the delete link to match other similar interfaces.

Note: This patch contains whitespace changes. Please diff
accordingly.

Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>