Revert step-07 secondary organisation cleanup to preserve distinct semantics

The original database author clarified that org1 (org:organization) and
org2 (tm:secondaryOrganisation) have different semantics: org2 represents a
group/organisation within which someone did work at org1. Removing and
promoting secondary organisations was losing this information.

Remove the two queries (001-remove-duplicate, 002-promote-secondary) and
regenerate graph-07.ttl and graph-08.ttl.

updates_step07/001-remove-duplicate-secondary-org.rq

@@ -1,15 +0,0 @@
-# Remove tm:secondaryOrganisation when it equals org:organization.
-# Affects 230 memberships.
-
-PREFIX tm:  <https://daniel.degu.cl/ontologies/theatre-migrants/>
-PREFIX org: <http://www.w3.org/ns/org#>
-
-DELETE {
-  ?s tm:secondaryOrganisation ?secondary .
-}
-WHERE {
-  ?s a org:Membership .
-  ?s org:organization ?primary .
-  ?s tm:secondaryOrganisation ?secondary .
-  FILTER(?primary = ?secondary)
-}

updates_step07/002-promote-secondary-to-primary-org.rq

@@ -1,18 +0,0 @@
-# When a membership has tm:secondaryOrganisation but no org:organization,
-# promote the secondary to primary.
-# Affects 256 memberships.
-
-PREFIX tm:  <https://daniel.degu.cl/ontologies/theatre-migrants/>
-PREFIX org: <http://www.w3.org/ns/org#>
-
-DELETE {
-  ?s tm:secondaryOrganisation ?secondary .
-}
-INSERT {
-  ?s org:organization ?secondary .
-}
-WHERE {
-  ?s a org:Membership .
-  ?s tm:secondaryOrganisation ?secondary .
-  FILTER NOT EXISTS { ?s org:organization ?primary }
-}