LDEV-4092: Date passed back by server was reconverting time for Daylight Saving, making it an hour out, as the convertToStringForJSON takes the timezone into account. Therefore convert the already timezone converted time (which gets converted back again) rather than the original time.
LDEV-4092: Support the server supplying a localised date string for the submission deadline (datetimepicker does not have localisation of the format, just the language).
LDEV-4032 Non-leaders should be forced to wait for leaders to submit notebook and burning questions. Therefore they should not be allowed to press Finish button before these events.
LDEV-4036 Readjust thickbox so it doesn't have extra scrolls* Also made Thickbox to always use default values for width:90% and height:100%. In case when these values should be different, one can provide width and height values as parameters
