Bug fix for bug #15173 (https://gna.org/bugs/?15173), the missing local_tm variable.
This is to fix the problem reported by Edward d'Auvergne (https://gna.org/users/bugman) after
clicking 'Execute Relax' in the model-free calculation. It is the patch file 'patch'
https://gna.org/support/download.php?file_id=7749 attached to task https://gna.org/task/?6847.
The problem was the local_tm variable was missing in relax_gui.py.
