Move end years code generation to Cliopatria

[edwardchalstrey1]

The populate_videodata command script has a part where we generate end years for each shape, based on some logic involving the start year and the years in the name_years.json - it might be better to forward this to Jim Bennett/ Cliopatria team for them to use to add a field for the end_year to each shape, meaning that we'd only need a single GeoJSON for Cliopatria, and the command script could also be simplified

TODO

• [x] Write a script that does the above - see #167
• [x] Send to Jim et al
• Should we just use the colours in the dataset? How are these being generated?
• [x] https://github.com/Seshat-Global-History-Databank/seshat/issues/19
• [x] Once Cliopatria has end years included, update the populate_videodata command script
• [x] Make the populate_videodata command script accept a single geojson file and update rst doc to reflect this
• [x] There is a problem with using GeoPandas as part of the populate_videodata command script in that it causes a segmentation fault (this is something to do with conflict between Geopandas and GEOS). Instead, move the function that converts the geoJSON in geopandas by adding extra fields to a new conversion script that spits out a new GeoJSON. This can then be loaded much more quickly by the webapp and notebook since the colours are already generated
  • [x] Make the Cliopatria notebook and the command script use the exact same code - call it the cliopatria handling module

[edwardchalstrey1]

Update: Jim is incorporating this into the Seshat code