Implement TurningMessageIDsIntoRocks.monolithic-zope3-philikon-messages-as-rocks

Two things of that proposal were modified during the implementation:
- message ids are now simply called Messages (first, because of simplicity,
  2nd because of differentiation to the old message ids)
- the % operator for filling the message id mapping was not realized
  because it breaks the rule that messages behave like (unicode) strings
  in all circumstances.

This is being checked into a branch because Jim and I couldn't figure out
what is wrong with the __reduce__ method implementation (it breaks with a bus
error). Once that is resolved we'll merge.

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