Nested sortable tree

Nested sortable tree


Hello,
I've took the concept for the tree component foreseen for 1.8 and made
it work just fine I think.
You can have a try on: http://sandbox.tinctuur.be/tree
I hope you guys have time to debug or check if it's good enough to
make a final release. I've used some code from 1.6 trunk and the tree
file in the 1.8 folder. I've adjusted the ui.sortable.js a bit to make
it work. And I didn't need the sortIndicator option that was foreseen.
Let's make a kicking ass tool together!
Greetz,
Karel-Jan