EUCA-6576, EUCA-7750, EUCA-7751
- Rework the event listener exemption of expando/checkbox clicks to stop the redraw when either of those changes.
- Don't optimistically stuff newly-created tags in the model. Wait until the server pushes the new tags back down instead.
Avoids new tags disappearing and reappearing later.
Merge pull request #121 from eucalyptus/EUCA-6576_EUCA-7750_EUCA-7751

Euca 6576 euca 7750 euca 7751 - multiple problems with expandos and tag updates, whitespace fixes