Get latest stable release of jstree; and patch multiselect in OSX
Don't allow selection of child nodes (of selected); Also don't allow deselect to deselect the primary-selected node.. it always should be selected;
Allow multiselected nodes to be moved with the 'Move' toolbar actions
If 'Move Down Into...' target is selected, deselect it so the move can go ahead with the rest of the selection;
Merge pull request #514 from hudmol/jstree-multiselect-patch

[Delivers #46462289] jstree multiselect patch