Add tree-level to checkboxWizard

[ghost]

I noticed that in Isotope they have a tree-checkboxwizard, which allows them to specify items in a collapsable checkboxWizard tree, e.g. basically a checkbox tree style (for alexf) combined with the orderable view of a checkbox wizard. Isotope calls this control AttributeWizard, but they have some code specific to isotope, but we can rather make it operate like alexf's tree view.

I also like the fact that its possible to show items that are disabled from selection, but still moveable, e.g. internal fields or stuff like that.

Here is an example of what I mean:

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--- Originally created by thyon on September 23rd, 2010, at 03:16pm (ID 2565)

[HellPat]

We could also use this for the 'edit more' function. So the fieldsets could be grouped in such a nice collapsible tree and is easier to use then?!

--- Originally created on June 21st, 2011, at 08:35pm

[aschempp]

If you can keep compatibility (or at least the features like disabled options), I'd love to incorporate that into Isotope and drop our Widget! Feel free to use our source...

--- Originally created on June 21st, 2011, at 08:38pm

[Toflar]

Would be really nice to take that to another level. Instead of just expanding and collapsing the groups, it would be fantastic if there was an additional checkbox right next to the expand/collapse icon so a user could also check/uncheck ALL items of a certain branch of the tree.

[leofeyer]

This has been implemented meanwhile.