Bug 11671 - Restructure patron lists add form for improved usability

Non-standard interface features have the potential to cause confusion.
This patch brings various aspects of the patron lists add page into
conformity with other staff client pages.

- Add "select all/clear all" links for the checkboxes
- Add a "remove selected" to the top of the table (see also Lists)
- Split functionality of add from from delete form
- Hide "Add patrons" button until at least one patron has been selected
- Remove non-standard trash can icon from table's checkbox column
- Exclude checkbox column from table sorting
- Add confirmation to deletion actions
- Improve breadcrumb specificity
- Add title-string sorting to date column to accommodate sorting for all
  date format types

To test, apply the patch and create a patron list.

1. Search for and select patrons for the list. Selecting a patron should
   trigger the display of an "Add patrons" button.
2. Click "Add patrons" and confirm that the add process completes
   correctly.
3. Search for and select a patron and also check the box next to an
   existing patron. Click "Add patrons" and confirm that no patron is
   removed.
4. Check that the "select all" and "clear all" links work correctly.
5. Select patrons on the list and click the "Remove selected" link. You
   should be prompted to confirm your choice.
   4.a. Click cancel and confirm that the deletion process aborts.
   4.b. Click OK and confirm that the deletion process completes.
6. Repeat step 4 with the "Remove selected patrons" at the bottom of the
   page.
7. Confirm that the page title and breadcrumbs correctly show the list
   name.
8. Switch between us and metric dateformat settings and confirm that
   table sorting by date is correct in both cases.

Followed test plan. Patch behaves as expected.
Signed-off-by: Marc Véron <veron@veron.ch>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Works as described, no regressions found.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>