Disable Maxime's progress bar script during regression runs.

regression.py

@@ -62,6 +62,9 @@ def main():
     """Run the TASTE regression-checking project suite"""
     cwd = os.path.dirname(os.path.realpath(__file__))
 
+    # Stop Maxime's GUI progress bar from appearing
+    os.putenv("DISABLE_PROGRESS_BAR", "1")
+
     # Navigate to the folder hosting all test projects (i.e. "Demo_*/")
     os.chdir(cwd)