hat-test: more scaling and clipping options.

This adds the ability to turn off hat-test's normal scaling of the
bounding box to fit on an A4 page, which I intended for printing test
patches (but never actually found a need to print one). The --unscaled
mode seems more useful if you're planning to turn the output into an
image, e.g. to use as a desktop background.

Also added --clip, which generates a rectangle completely covered in
hats (i.e. shows any hat that overlaps the output rectangle at all),
as opposed to the normal mode which omits any hat that doesn't fit
_entirely_ in the output rectangle (more similar to what Loopy wants).

Actually generating a desktop background by this method is still a bit
fiddly to get right, but it's better than before.

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