Products-masterselectwidget

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* Fixed some IE bugs and made hiding use display="none" to remove the
element from the page. Thanks to Yuta Kashino for pinting these out.
[alecm]

* Added new action for changing value in StringFields using simple
widgets. Thanks to Joachim Koenig-Baltes for the idea and patch.
[alecm]

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* Fixed bug that caused unnecessary js alert when hiding some widget types.
[alecm]

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* Added support for hiding and disabling compound widgets like Boolean
and InAndOut.
[alecm]

* Added the ability for a single master to apply multiple actions on a
single slave. Now a master widget can both hide and change the
vocabulary of a slave field. Just add an entry to slave_fields for
each action desired.
[alecm]

* Made getXMLSelectVocab accept methods that return lists or tuples
instead of only DisplayLists. DisplayLists are preferred though.
[alecm]

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* Initial checkin, ready for testing.
[alecm]