OneZoom vis does not work for the output tree of DropTip analysis

[XiaoxiaoLiu]

[XiaoxiaoLiu]

Disabled the seg fault for now.
OneZoom requires a input file dataobject type to pass in the newick tree txt string (from file) into the OneZoom javascript file. To fix this properly, we need to implement vtkNewickWriter to generate a txt string from vtkTree.