New OSM API to limit upload to 10k changes

[maning]

A new API upload limit will happen soon, see: openstreetmap/openstreetmap-website#1259

We have blocks that has >10K changes and we need to find a way to either:

1. subdivide the big blocks, or,
2. make it explicit in the importing guide how to fix this via JOSM upload dialog, see: https://josm.openstreetmap.de/wiki/Help/Action/Upload#ChangesetFull

[pnorman]

Uploading changesets that large is a bad practice because you have to do it in chunks and you can end up messing up data by leaving a bunch of stray nodes if you get an interrupted connection.

[maning]

Thanks @pnorman, I'm leaning towards sub-dividing the blocks. Will do this in the data chunking step.

[maning]

JOSM already splits the upload into several changesets when it reached the API limit. Closing.