Chris Hill-Scott e7aad61220 Use pure Python Rtree library ...

The Python rtree library we are using to build RTrees has a dependency
on the C package libspatialindex. This package is not installed on PaaS,
so it’s hard for us to use it.

This commit changes the code to use a library called rtreelib instead.

rtreelib doesn’t have a built in way to serialise the index it builds,
so I’ve had to implement that using pickle.

2021-04-13 12:43:28 +01:00

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