Remove unused method

Also removes an import from outside the gen module.

gramps/gen/dbstate.py

@@ -257,36 +257,3 @@ class DbState(Callback):
                         pass
                     return (dirpath, locked, locked_by, backend)
         return None
-
-    def import_from_filename(self, db, filename, user=None):
-        """
-        Import the filename into the db.
-        """
-        from .plug import BasePluginManager
-        from .const import PLUGINS_DIR, USER_PLUGINS
-        from gramps.cli.user import User
-        pmgr = BasePluginManager.get_instance()
-        if user is None:
-            user = User()
-        (name, ext) = os.path.splitext(os.path.basename(filename))
-        extension = ext[1:].lower()
-        import_list = pmgr.get_reg_importers()
-        if import_list == []:
-            # This might happen if using gramps from outside, and
-            # we haven't loaded plugins yet
-            pmgr.reg_plugins(PLUGINS_DIR, self, None)
-            pmgr.reg_plugins(USER_PLUGINS, self, None, load_on_reg=True)
-            import_list = pmgr.get_reg_importers()
-        for pdata in import_list:
-            if extension == pdata.extension:
-                mod = pmgr.load_plugin(pdata)
-                if not mod:
-                    for item in pmgr.get_fail_list():
-                        name, error_tuple, pdata = item
-                        etype, exception, traceback = error_tuple
-                        print("ERROR:", name, exception)
-                    return False
-                import_function = getattr(mod, pdata.import_function)
-                results = import_function(db, filename, user)
-                return True
-        return False