Rename update_schema to _create_schema

gramps/plugins/db/dbapi/dbapi.py

@@ -166,9 +166,9 @@ class DBAPI(DbGeneric):
         # We use the existence of the person table as a proxy for the database
         # being new
         if not self.dbapi.table_exists("person"):
-            self.update_schema()
+            self._create_schema()
 
-    def update_schema(self):
+    def _create_schema(self):
         """
         Create and update schema.
         """

gramps/plugins/db/dbapi/inmemorydb.py

@@ -42,7 +42,7 @@ class InMemoryDB(DBAPI):
         Create an in-memory sqlite database.
         """
         self.dbapi = Sqlite(":memory:")
-        self.update_schema()
+        self._create_schema()
 
     def write_version(self, directory):
         """Write files for a newly created DB."""