Function to Synchronize trench_point.geometry and attribut altitude_channel_bottom

[sjib]

Hoehe_Kanalsohle bei Trassepunkt - function necessary as with
Abwasserknoten.Lage und Sohlenkote - see CREATE OR REPLACE FUNCTION tww_app.synchronize_level_with_altitude_on_wastewater_node()
oder Deckel.Kote und Deckel.Lage (as they are now 3D geometries)

[jpdupuy]

@sjib this relates to the wastewater model, not for distant heating

[sjib]

I just pointed to wastewater as example. It has to be adapted to for TDH.
Maybe something for the next step after all data model questions have been solved.