added patch_70_71_b.sql which fixes a potentially missing primary key on mapping_set table

sql/table.sql

@@ -510,6 +510,8 @@ INSERT INTO meta (species_id, meta_key, meta_value) VALUES
 # NOTE: Avoid line-breaks in values.
 INSERT INTO meta (species_id, meta_key, meta_value)
   VALUES (NULL, 'patch', 'patch_70_71_a.sql|schema_version');
+INSERT INTO meta (species_id, meta_key, meta_value)
+  VALUES (NULL, 'patch', 'patch_70_71_b.sql|mapping_set_index');
 
 /**
 @table meta_coord