Indexing features at and beyond the antimeridian

[sgillies]

Follow up on #61. Mapbox.com allows the creation and upload of features that extend W of 180dW and E of 180dE. How are these indexed?

There's definitely a search issue raised: given a bbox like 170, 5, 175, 10 should we expect to find the point [-187.5, 7.5]? Likewise, given a bbox like -190, 5, -185, 10 should we expect to find the point [187.5, 7.5]?

Should carboard normalize input features or do more splitting of its queries across the antimeridian?

[sgillies]

Conclusion: after double checking tilebelt's math (see end of https://github.com/mapbox/hey/issues/2977), I'm certain that features that go beyond the antimeridian into the shadowy "other worlds" can be found when searching the "real world." No need to fix features.

However, we do need to split search boxes at the antimeridian if we want to efficiently search for small features near it.