[openstreetmap/openstreetmap-website] Reduce maximum changeset size to 10k changes (#1259)

[Paul Norman]

> One minor point is that this feels like papering over the cracks. If the diff uploads are taking too long and timing out, we should find out the cause - either the code is inefficient (likely more complex for deletes than additions), or the databases are too busy. It could be better to solve those problems instead.

The changeset limit is more about downloads failing and keeping changesets to an understandable size. 10k changes in a single upload is still likely to fail. When I was doing coastline replacements 2-5k was about the maximum upload chunk size.

I'd actually prefer a maximum changeset size that could reliably be uploaded in one chunk and represents the high end of what is a reasonable amount of work for a person to do in a reasonable amount of time, but that would be controversial.

zerebubuth/openstreetmap-cgimap#111 should help the downloads somewhat, but all the other reasons for decreasing the size remain.

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