set clipCircle precision to 2 degrees #282
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Results in 180 control points instead of 60 (⨉3). The error is quadratic with the precision, with the worst case (for a parallel) being at latitude 45°. Under this new setting, the maximum error is now ~484m, vs. 4.365km with precision 6°. https://observablehq.com/@d3/geocircle-error
following #281 (note that for clipCircle the precision is not modifiable by the user) Manually rechecked each of the tests that are (slightly) modified as a consequence
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complements #281
closes #270