This is the cause of, and fixes zerebubuth/planet-dump-ng#12 -
the temporary data for changeset comments dates from February.
I had thought that having the temporaries resumable would make
sense, but it seems that it's more confusing to have it keep old
data around like that...
-rm -rf changesets changeset_tags
+rm -rf changesets changeset_tags changeset_comments
rm -rf nodes node_tags
rm -rf ways way_tags way_nodes
rm -rf relations relation_tags relation_members
rm -rf nodes node_tags
rm -rf ways way_tags way_nodes
rm -rf relations relation_tags relation_members