added proper logging facility

src/damaris/gui/ExperimentHandling.py

@@ -3,10 +3,13 @@ import io
 import traceback
 import sys
 import time
+import logging
 import ast
 from damaris.experiments.Experiment import Quit
 from damaris.experiments import Experiment
 
+logger = logging.getLogger("damaris.experiment_handling")
+
 class StopExperiment(Exception):
     pass
 
@@ -66,7 +69,7 @@ class ExperimentHandling(threading.Thread):
                             found_blocking_sleep = True
                 
                 if found_blocking_sleep:
-                    print("Warning: time.sleep() detected in experiment script. This is blocking and not interruptible. Please use sleep() instead.")
+                    logger.warning("time.sleep() detected in experiment script. This is blocking and not interruptible. Please use sleep() instead.")
                     break
         except Exception:
             pass