Update devstart to use new demo service.

devstart.py

@@ -25,7 +25,7 @@
 from lute.app_factory import create_app
 from lute.config.app_config import AppConfig
 from lute.db import db
-from lute.db.demo import load_demo_data
+from lute.db.demo import Service as DemoService
 
 log = logging.getLogger("werkzeug")
 log.setLevel(logging.ERROR)
@@ -49,7 +49,8 @@ def dev_print(s):
     dev_print("")
     app = create_app(config_file, output_func=dev_print)
     with app.app_context():
-        load_demo_data(db.session)
+        svc = DemoService(db.session)
+        svc.load_demo_data()
 
     ac = AppConfig(config_file)
     dev_print(f"\nversion {__version__}")