Add row wrapping div to fix IE7 float bug

IE7 doesn't quite understand floating and clearing elements so doesn't
position the headers next to the list of links they are associated to.
Instead the headers float up to the list above the one it is intended
for.

This adds a wrapping div to each list of links which forces the heading
to clear the previous list and sit next to the list it is intended for.
Rake task to requeue all scheduled publishing jobs.

At the moment, after a database restore, the list of scheduled editions
does not match the list of sidekiq jobs in redis.  There is an existing
task to add jobs for any editions that have mising jobs.  This works for
some cases, however it fails to account for editions that are no longer
scheduled (orphaned sidekiq jobs), or editions that have have their
scheduled time changed.

To address this, we therefore delete all sidekiq jobs for the
ScheduledPublishingWorker and then re-queue all editions that are
scheduled for publication.
Merge pull request #1747 from alphagov/requeue_all_scheduled_rake_task

Rake task to requeue all scheduled publishing jobs.
Merge pull request #1746 from alphagov/ie7-floats

Add row wrapping div to fix IE7 float bug