Hierarchial Outline frame ordering

[tfer]

The suggestion I added to "Automatically add frames for elements with a description tag", where I proposed naming framing objects thus: sz_1, sz_2, sz_3, ... could easily be extended to set up an outline, or tree structure:

    sz_0 # the top view
    sz_1
      sz_1.1
      sz_1.2
    sz_2
      sz_2.1
        sz_2.1.1
        sz_2.1.2
    sz_3

We would have to add a state property of collapsed/expanded along with a visual way of indicating that state, but with this arrow navigation can follow the conventions used in 'tree view' navigation.

A simple way, (and there are many others) to indicate state would be to have a graying-out overlay on those frames that are collapsed, if you are at the parent frame, down arrow skips to the next open sibling, whereas left arrow would un-gray them so the next down arrow, or even left arrow would tranverse them.
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