Autumn21

[ifpains]

Overview of the modifications:

• snakes.py: Correction of the dbscan seeding plots (if enabled at configFile)
• ddbscan_inner.py: Isolation seeding is now done outside of the last clustering loop (good speedup with the same results); the RANSAC used in the dbscan seeding was changed (the dbscan seeding is slightly slower, but since fewer clusters are being selected to the directional clustering, it was a good speedup in general and the results of the clustering are satisfactory)