Fix up more futures

More future cleanup.

err_tmp.chpl: Fixed test program which was incorrect and removed the
              future because it works now (future was accidentally
              removed in the previous commit).

override_overload.future: Added more info.  This is a
              non-deterministic failure.  Point Noakes to it for his
              OS/X bug hunt.

New .bad files:
- histogram/reductionex_class.bad
- histogram/reductionex_record.bad
- int32method.bad
- module_new.bad