Collect features for new postprocessing

[nesnoj]

@chrwm and I talked about postprocessing which would be nice to have in open-mastr.

Check out existing and orphaned stuff

• Stuff from earlier versions, mainly written by @gplssm, which is not part of the current code base anymore (is it?)
• Issues with tag post processing
• Old jupyter nbs
• App EE-Status (?)
• Marktstammdatenregister.dev -> esp. repo stat

Features

• Cleanse data: e.g. drop duplicates, check plausibility etc.
• Geocode units without coordinates (<=30kW) using zip code and city and, as option, aggregate them (I implemented this recently)
• Useful table joins:
  • grid data: e.g. voltage level: join locations_extended and grid_connections on units table
  • storage capacity: join storage_extended and storage_units #416
• Filter by attributes
• Geospatial operations such as clipping

Feel free to amend this list..

[khelfen]

Just adding my small geocoding repo here :)