- folderChildrenService divided into childrenService for GET and folderService for other CUD
- messaging now more fine-granular for update, recycle, unrecycle, delete. so a treeCell only gets notified for its very treeItem, not for all.
- tested childrenService and folderService usage in treeItemCellCtrl
- corrected events usage in folderEditCtrl and spaceEditCtrl
- corrected several locations with wrong syntax due to refactoring