Bug 11565 [QA Followup] - Hide checkout options when not in use

Bug 11565 [QA Followup] - Hide checkout options when not in use

This follow-up reformats the checkout screen so that checkout settings
like specify due date, on-site checkout, and override high holds are
grouped in a panel which is hidden by default. Clicking a link shows all
the available settings.

Also modified in this patch: The default color for div.hint has been
made a little darker for readability.

To test, apply the patch and clear your browser cache if necessary.

- Check out to a patron who is not blocked from checking out.
- Click the "Checkout settings" link and confirm that the settings panel
  is displayed.
- Test that the settings in the panel behave as expected.
- Test with preferences on and off: decreaseLoanHighHolds,
  OnSiteCheckouts, SpecifyDueDate.

NOTE: This patch is a work in progress. It does not address the issue of
checkout setting being hidden even if they are active.

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>