Simplified box's horizontal attribute
Removed commented out code
Re-factored code for checking radio buttons
Drag data now includes backside widgets

So when dragging and dropping across browsers robots and other widgets
accompany the widget.
Copy now copies backside widgets too

Also fixed a bug with drag and drop when scrolling.
Dropping a box resource on itself ignored

Instead of triggering a stack overflow.
Backside buttons have titles

And a bug when a robot action copies a widget fixed.
Re-opened backsides include widgets

Widgets saved when closed.
Re-opened backsides can now run

Because 'owner' data is associated with the new element.
Backside button titles simplified

Since including toString() often displayed out of date information.
Further Caja experiments