Bug 33560: Batch edit link broken if subscriptions are selected using "select all...

Bug 33560: Batch edit link broken if subscriptions are selected using "select all" link

This patch revises the process by which the serials search results page
redirects to the batch edit page based on which checkboxes are checked.

To test, apply the patch and go to serials. You should have some
subscriptions which are open and some which are closed.

- Perform a search which will return at least one result under each tab
  (Open and Closed).
  - Checking one or more checkboxes should activate the "Edit selected
    serials" link, which should work correctly to redirect you to the
    batch edit page.
  - Unchecking all the checkboxes should make the edit link disappear.
  - Check that the "Select all" and "Clear all" links work the same way
    manually checking checkboxes does.
  - Confirm that controls under each tab work correctly just for the
    results under that tab.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>