Bug 10836 - New layout for placing holds in the OPAC

Bug 10836 - New layout for placing holds in the OPAC

This patch changes the layout of the OPAC's place hold screen,
eliminating the table in favor of a more flexible, open display.

To test, place single and multiple holds under various conditions:

- Items which are not available to be place on hold
- With OpacHoldNotes on and off
- With OPACItemHolds on and off
- With OPACAllowHoldDateInFuture on and off
- With IndependentBranches on and off
- With JavaScript disabled

Test setting hold notes, holding specific copies, and setting hold start
dates. When setting a hold start date and hold expiration date, the two
datepickers should work together to prevent invalid date combinations
(dates after today, expiration dates which precede the start date).

Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>