add formatted date on hover option to the datepicker widget

For Example change this line:

"' href='#'>" + printDate.getDate() + "</a>")) + "</td>";

to this, but offer formatting configuration options.

"' href='#' title='"+ this.formatDate("oo", printDate)+ "'>" + printDate.getDate() + "</a>")) + "</td>";

Nice to see another format such as Day of Year when hovering over a calendar day. or just flag to enable hovering day of year for every calendar day.