entsoe: Detiling using a preprocessing python script

[coroa]

1. A python script was added to stitch the vector tiles from the entsoe map according to the identifier attribute ‘oid’ before importing the line structures into GridKit, since the toolkit previously often mislabeled the overlapping parts of the same line as two separate circuits.
2. The tolerance for connecting dangling high-voltage direct current (HVDC) lines and their converter stations with the next high-voltage alternating current (HVAC) substations has been increased and the new connections have been manually verified.
3. AC lines carrying circuits of several voltage levels had to be split by inspecting the descriptive text tag and are split into several lines.
4. The columns and format of the extracted CSV lines have been aligned closer with PyPSA.