Bug 21132: Highlight active filters on saved report page

Bug 21132: Highlight active filters on saved report page

This patch adds a more obvious way of see which search terms have been
submitted to filter the table of saved reports.

The patch also moves embedded CSS into a separate file.

To test you should have multiple saved reports.

- Apply the patch and go to Reports -> Use saved.
- Filter the table of reports by submitting one or more terms in the
  sidebar "Filter" form.
- Confirm that the terms you submit are shown at the top of the table of
  results.
- Confirm that clicking the "Clear" link clears the search filter.

Signed-off-by: Maryse Simard <maryse.simard@inlibro.com>
Followed the test plan and it works.

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>