attempt to display location of out of memory errors in interpreted code * pt-eval.cc (tree_evaluator::visit_statement): Handle std::bad_alloc exception here. * toplev.cc (main_loop): Simplify out-of-memory error message. * octave.cc (safe_source_file): Don't handle std::bad_alloc here. (execute_eval_option_code): Likewise. * ov-oncleanup.cc (octave_oncleanup::~octave_oncleanup): Likewise.