Add new CollectionDumper output

Author: benmwebb

test/test_format.py

@@ -1311,11 +1311,23 @@ def test_cif_token_reader_replace_category_filter(self):
 _ihm_entry_collection.details
 foo bar 'more text'
 #
+#
+loop_
+_ihm_entry_collection_mapping.collection_id
+_ihm_entry_collection_mapping.entry_id
+foo model
+#
 loop_
 _ihm_entry_collection.id
 _ihm_entry_collection.name
 _ihm_entry_collection.details
 foo bar 'more text'
+#
+#
+loop_
+_ihm_entry_collection_mapping.collection_id
+_ihm_entry_collection_mapping.entry_id
+foo model
 
 #
 """)