Chris Hill-Scott e20483c462 Add print timings to letter timings ...

It will also be useful to know (especially for the API):
- when a letter was printed
- if it’s been printed or not

This commit:
- adds code to calculate these two pieces of information
- refactors the function to return a `namedtuple` – a tuple of two items
  was manageable, but with four items it was getting hard to know what
  each one meant – this lets us label each piece of information that is
  being returned

2017-07-14 20:09:23 +01:00

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