Restructure log location

Resolves #7 (closed)

mpsd-software-environment.py

@@ -270,7 +270,12 @@ def set_up_logging(loglevel="warning", filename=None):
     shell_handler.setFormatter(shell_formatter)
     # use the log_level_numeric to decide how much logging is sent to shell
     shell_handler.setLevel(log_level_numeric)
-    logger.addHandler(shell_handler)
+    
+    # Here we set the handlers of the RootLogger to be just the one we want.
+    # The reason is that the logging module will add a <StreamHandler <stderr>
+    # (NOTSET)> handler if logging.info/logging.debug/... is used before we
+    # come across this line. And we do not want that additional handler.
+    logger.handlers = [shell_handler]
 
     # if filename provided, write log messages to that file, too.
     if filename: