Regressions in [9275] in ComboBox

[haysmark]

Bill, please test your changeset, [9275] :

1. hasDownArrow no longer works for ComboBox? and FilteringSelect?: all ComboBoxes? and FilteringSelects? have down arrows, even with those that have hasDownArrow=false.
2. The dynamically created ComboBox? in test_ComboBox has no options.

[bill]

(In [9298]) - support onClose parameter to dijit.util.open() to detect when popup was closed by an explicit call to close() or by the user clicking on an empty area of the page

• switch dijit.util.open take named parameters instead of positional parameters
• open by default closes other opened popups, submenu param controls this

Refs #3517

Also fixed missing call to superclass postMixInProperties (thanks Mark). Refs #3522

[bill]

(In [9329]) Fix path to data files. Fixes #3522.