dijit.form.Form.submit needs to stop the event, not return false

[nathan]

Related to issue #4205 (see comment 17)

For a test case, you can go to http://download.dojotoolkit.org/current-dev/dojo-release-1.1.0rc1/dijit/tests/form/Form.html and fill out an invalid date, and click on Submit. The validation will fail (it will tell you that the form is invalid) - but the form will submit anyway. There is no way to prevent the original form element from submitting.

[nathan]

Already fixed in svn.

[bill]

Right, this is a dup of #6280, #6292, and #6299.