Code Review requested on DateBox

[Ray Ryan]

Hey, John. 

This is not small, I'm afraid, but it's not outrageous either. It's already committed to the 1_6_date_picker branch, and can be reviewed there. 

http://code.google.com/p/google-web-toolkit/source/detail?r=4165

From the change log:

Makes DateBox implement ValueChange, and makes it, like, work. Adds unit tests

for DateBox and DatePicker. Removes some broken event handling methods from

DateBox that aren't worth fixing b/c they can be done directly to its textbox

instead. Adds notion of an autoHidePartner to PopupPanel, to keep picker from

disappearing during mouse events in the date box text field. Should be generally

useful.