Bug 8498 - can't specify an hour when specifying due date

Bug 8498 - can't specify an hour when specifying due date

With hourly loans Koha can make items due specific hours,
but if you have the specify due date box on the checkout
screen you can't enter an hour/minute. It will always default
to 23:59.

* Add jquery timepicker plugin
* Update jquery ui to include timepicker prerequisite slider
* Set timepicker's default time to 23:59, remove the hard
  coded 23:59 setting from circulation.pl
* Resize input fields such that the entire date and time are
  visible.

Signed-off-by: Marc Veron <veron@veron.ch>
Works as expected, input field displays entire date and time.

Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>