U4-5461 - Further amends to date picker behaviour

Following up on issues found with previous pull request #491 that was accepted.

Removed close of date/time picker on date selection when set up with time picker.
Close picker in either form when you on click on document behind the picker.  I've used a jquery document click event for the latter, which perhaps isn't the most angular way, but works for what's needed here - as otherwise the time version can't be closed.