Bring a little more compability with GNU units 2.12

- notionally support a 'history file' flag. This doesn't do much now,
  but is there to prevent scripts written against GNU units from
  breaking
- correctly gracefully quit rather than exit (this will make it easier
  to support a history file in the future)
- remove the "t" flag from fopen which was there to support windows. We
  have not supported windows since at the latest, the introduction of
  capsicum.

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