Replace jscalendar with JQuery UI calendar

See bug #1259685 for more info on what JQuery is doing so that we don't potentially replicate what already exists when we come back to this.

Reposting Robert's comment from Bug 1259685:

This roadmap for the jQuery UI datepicker is interesting so I'll a link to it here
http://wiki.jqueryui.com/w/page/12137778/Datepicker

It sounds like they are trying to get some usability issues sorted out.

If we can get Datepicker and timepicker plugin (possible option)
http://trentrichardson.com/examples/timepicker/

going with keyboard accessibility that would be most useful.

Question is should we wait until others have sorted this issue - or should we take a look at sorting this ourselves?

As I understand it, the current date/time picker is not keyboard accessible, so something will need to be done.

https://reviews.mahara.org/#/c/3407/

Patch for "master" branch: https://reviews.mahara.org/3413

Patch for "master" branch: https://reviews.mahara.org/3414

Patch for "master" branch: https://reviews.mahara.org/3416

Patch for "master" branch: https://reviews.mahara.org/3415

Have split this patch up into multiple patches to deal with the adding of timepicker, adjusting timepicker, adjusting pieform calendar element, and removing of old jscalendar:
https://reviews.mahara.org/3413
https://reviews.mahara.org/3414
https://reviews.mahara.org/3415
https://reviews.mahara.org/3416

Reviewed: https://reviews.mahara.org/3413
Committed: http://gitorious.org/mahara/mahara/commit/0fe114ca8b5e39d39cdeb6e62505ecbb18632731
Submitter: Yuliya Bozhko (<email address hidden>)
Branch: master

commit 0fe114ca8b5e39d39cdeb6e62505ecbb18632731
Author: Robert Lyon <email address hidden>
Date: Fri Jun 6 09:21:03 2014 +1200

Adding the jquery-ui timepicker addon (Bug 1267239)

To work with datepicker (part of jquery-ui) to allow for calendar to
pick time as well

Change-Id: I46ea265818cdad5acc5a38d20337311cfe09e352
Signed-off-by: Robert Lyon <email address hidden>

Reviewed: https://reviews.mahara.org/3414
Committed: http://gitorious.org/mahara/mahara/commit/bdac0f06557fffc89833e7456967dcfadc1b299c
Submitter: Robert Lyon (<email address hidden>)
Branch: master

commit bdac0f06557fffc89833e7456967dcfadc1b299c
Author: Robert Lyon <email address hidden>
Date: Fri Jun 6 09:27:09 2014 +1200

Adding keybindings to timepicker (Bug #1267239)

Can now adjust hour/minute values with keyboard

The key bindings added for timepicker:
(to avoid clashes with existing key bindings)
ALT+UP: Move hour slider up one step
ALT+DOWN: Move hour slider down one step
SHIFT+LEFT: Move minute slider down one step
SHIFT+RIGHT: Move minute slider up one step

Change-Id: If073908f070eada92dfa4d010f28ed53f7ac3b04
Signed-off-by: Robert Lyon <email address hidden>

Reviewed: https://reviews.mahara.org/3415
Committed: http://gitorious.org/mahara/mahara/commit/3340ef27d6ead60bf9e3aa9950d777e38bcf9a8c
Submitter: Robert Lyon (<email address hidden>)
Branch: master

commit 3340ef27d6ead60bf9e3aa9950d777e38bcf9a8c
Author: Robert Lyon <email address hidden>
Date: Fri Jun 6 09:33:43 2014 +1200

Updating calendar pieform element to use datepicker/timepicker

(Bug #1267239)

The datepicker is now keyboard accessible but not fully screenreader
accessible - but the folks at datepicker are working on that

The key bindings you need to know for datepicker:
PAGE UP: Move to the previous month.
PAGE DOWN: Move to the next month.
CTRL+PAGE UP: Move to the previous year.
CTRL+PAGE DOWN: Move to the next year.
CTRL+HOME: Move to the current month. Open the datepicker if closed.
CTRL+LEFT: Move to the previous day.
CTRL+RIGHT: Move to the next day.
CTRL+UP: Move to the previous week.
CTRL+DOWN: Move the next week.
ENTER: Select the focused date.
ESC: Close the datepicker

The key bindings added for timepicker:
(to avoid clashes with existing key bindings)
ALT+UP: Move hour slider up one step
ALT+DOWN: Move hour slider down one step
SHIFT+LEFT: Move minute slider down one step
SHIFT+RIGHT: Move minute slider up one step

Also added the prev/next year button options

Change-Id: Iff857ba9efb23fd123de6af8f78ceffee9c0ac79
Signed-off-by: Robert Lyon <email address hidden>

Reviewed: https://reviews.mahara.org/3416
Committed: http://gitorious.org/mahara/mahara/commit/9d7fa081b6365ac08fb1c20c2482dd1d42cab0bb
Submitter: Robert Lyon (<email address hidden>)
Branch: master

commit 9d7fa081b6365ac08fb1c20c2482dd1d42cab0bb
Author: Robert Lyon <email address hidden>
Date: Fri Jun 6 09:37:25 2014 +1200

Removing old jscalendar (Bug #1267239)

We are now using jQuery-ui datepicker + timepicker

Change-Id: I518490fb04a224a08fc3853386ab5e0eee7d2964
Signed-off-by: Robert Lyon <email address hidden>