grpc: added set session user call, updated mobility to look for files within new gui as well, fixed pygui issue when start session has a grpc exceptions, showing and empty error window

daemon/core/gui/coreclient.py

@@ -1,6 +1,7 @@
 """
 Incorporate grpc into python tkinter GUI
 """
+import getpass
 import json
 import logging
 import os
@@ -71,6 +72,7 @@ class CoreClient:
         self.default_services: Dict[NodeType, Set[str]] = {}
         self.emane_models: List[str] = []
         self.observer: Optional[str] = None
+        self.user = getpass.getuser()
 
         # loaded configuration data
         self.servers: Dict[str, CoreServer] = {}
@@ -289,6 +291,9 @@ class CoreClient:
                 self.session_id, self.handle_events
             )
 
+            # set session user
+            self.client.set_session_user(self.session_id, self.user)
+
             # get session service defaults
             response = self.client.get_service_defaults(self.session_id)
             self.default_services = {