make tree roots selectable, if tree does not start at "master" root
value
remove name attribute from nodes in search result to avoid their
selection
fix accidental assignment of global instead of local var
destroy deselected items at the end and just dispose them before,
because some descendant nodes of the disposed one are used after
disposition (fixes IE error, but is also the more correct approach)
Added input[type=checkbox|radio] like icons, use with `tl_class="radio"` or `tl_class="checkbox"`
updated README