Update lat/longs

[trvrb]

This commit pulls in all the heavily curated lat/long values from https://github.com/nextstrain/ncov/blob/master/defaults/lat_longs.tsv. These should have gotten a lot of eyes on them from daily ncov curation work and I'd hope that they'd just work without additional testing today.

I've found a large number of occasions where running analyses for other pathogens (measles, avian flu, etc...) we're dropping lat/longs with just warnings because they don't exist in the data. I think better to pad this out in Augur than to force all the individual pathogen repos to copy out a long list of lat/long locations.

If a pathogen repo wants to override, this is very possible.

[victorlin]

This doesn't affect workflows which use custom --lat-longs, which seems to be most of the currently maintained core workflows. Might be a good to create a higher level issue to track transition of pathogen workflows away from custom --lat-longs to use the improved default from this PR.

Failing CI in avian-flu is irrelevant, I'll address separately.

[trvrb]

Thanks @victorlin! You're right that it would be nice to slim down lat_longs.tsv files in individual repos. But at least getting this into Augur should reduce the amount that future lat_longs.tsv files need to be populated.