* Add deletion signal delete properties pictures and thumbnails
1.0.23
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* Add relation layer in vector tiles
1.0.22
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* Add layer pk in crud/settings map_layers (relation and extra_geom)
1.0.21
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* Rename crud/settings 'source' to 'view_source'
1.0.20
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* Change crud/settings generation so that '.menu[].crud_views[].map_layers' now includes related layer. A source attribute has been added to distinguish layers from "relations" and layers from "extra_geometry"
1.0.19
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* Fix concurrency issue when synchronizing relations between Features. This issue was causing data loss when a user tried to edit a feature properties while a celery task was also updating those properties.