Move event handlers to a dedicated event directory

app/corpora/events.py

@@ -5,7 +5,7 @@ from socket import gaierror
 from werkzeug.utils import secure_filename
 from .. import db, socketio
 from ..decorators import socketio_login_required
-from ..socketio_events import socketio_sessions
+from ..events.socketio import sessions as socketio_sessions
 from ..models import Corpus
 import cqi
 import math