Sets the metaData_print bit on node at <astr_path>.

def treeNode_metaSet(self, astr_path, **kwargs):
            """
            Sets the metaData_print bit on node at <astr_path>.
            """
            self.cdnode(astr_path)
            self.snode_current.metaData_print(self.b_printMetaData)
            return {'status': True}