update archive IDs

... to behave in a more straightforward way when dealing with
bookmarks/favourites/etc.

specific IDs are now grouped by their owner, album-id, ... to
allow for duplicates when it would be expected.

test/test_extractors.py

@@ -18,6 +18,7 @@ SKIP = {
     "archivedmoe", "archiveofsins", "thebarchive",
 
     # temporary issues
+    "powermanga",
 }