# @param theNodes identifiers of nodes to be doubled
# @param theModifiedElems identifiers of elements to be updated by the new (doubled)
# nodes. If list of element identifiers is empty then nodes are doubled but
# @param theNodes identifiers of nodes to be doubled
# @param theModifiedElems identifiers of elements to be updated by the new (doubled)
# nodes. If list of element identifiers is empty then nodes are doubled but