ISIS-479: fix for bulk update logic in the RO viewer.

... taking into account invisible, disabled and optional properties.
ISIS-475: further minor updates...

* cosmetic change to tables also extend to hearer
* UPGRADE Wicket to 6.9.1, wicketstuff to 6.9.0
ISIS-469: downloaded json metadata now also includes actions

in addition:
- some minor tweaks to CSS for prototype vs disabled actions.