terrain_modeling misses the boilerplate so it does not start

[wenzeslaus]

gs.run_command('r.in.lidar', help=True)
---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
<ipython-input-1-8ffa28569aeb> in <module>
----> 1 gs.run_command('r.in.lidar', help=True)

NameError: name 'gs' is not defined