Hats tiling: make hat-test draw each hat in one go.

By introducing a second callback between the client of hat.c and the
maybe_report_hat function, I enable the test main() to provide a
different version of that callback, so that instead of enumerating
each kite, it can directly generate a Postscript path per actual hat.
This should make it more useful to people wanting to generate hat
patterns for any other purpose.

The internal callback gets more details than the external one; in
particular, it receives a HatCoords, so that it can colour hats based
on their position in the hierarchical structure.

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