ST_DWithin Prepared

[Paul Ramsey]

If you build your own PostGIS and have a workload that uses ST_DWithin, it
would be great if you'd try out the development branch (master) and see if
your workload is any faster (or slower) after this change.

https://github.com/postgis/postgis/commit/48a31d424a91b9fda7c125a5c5594689e87d562c

Prepared geometry and caching are not cost free, but hopefully any use
cases that degrade only do so a tiny bit, because the ones that get faster
get quite a bit faster.

P.
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