Set of changes to allow merge/patch functionality: feature on db to not add sources or tags on import; all gen.lib objects' to_struct marks Handles rather than strings; Differences report (gramps-add) now shows all relevant changes

svn: r21098

gramps/gen/db/dictionary.py

@@ -195,6 +195,7 @@ class DictionaryDb(DbWriteBase, DbReadBase):
             }
         # skip GEDCOM cross-ref check for now:
         self.set_feature("skip-check-xref", True)
+        self.set_feature("skip-import-additions", True)
         self.readonly = False
         self.db_is_open = True
         self.name_formats = []
@@ -255,6 +256,20 @@ class DictionaryDb(DbWriteBase, DbReadBase):
         self.txn = DictionaryTxn("DbDictionary Transaction", self)
         self.transaction = None
 
+    def version_supported(self):
+        """Return True when the file has a supported version."""
+        return True
+
+    def get_table_names(self):
+        """Return a list of valid table names."""
+        return list(self._tables.keys())
+
+    def get_table_metadata(self, table_name):
+        """Return the metadata for a valid table name."""
+        if table_name in self._tables:
+            return self._tables[table_name]
+        return None
+
     def transaction_commit(self, txn):
         pass