code: function insert(root, nextTag, isVirtual) {
        if (isVirtual)
          { makeVirtual.apply(this, [root, nextTag]); }
        else
          { safeInsert(root, this.root, nextTag.root); }
      }
docs: Insert and mount a child tag
  @this Tag
  @param   { HTMLElement } root - dom node containing all the loop children
  @param   { Tag } nextTag - instance of the next tag preceding the one we want to insert
  @param   { Boolean } isVirtual - is it a virtual tag?