Simplify function and move to appropriate schema Since utm_covers() uses a function from schema users, it can be used only if appropriate access to the schema has been granted anyhow. Using current_user_area_utm() here to have a level of abstraction between utm_covers() and the modelling of the actual responsibility area.

teichmann@intevation.de = sascha.teichmann@intevation.de
bernhard.reiter@intevation.de = bernhard@intevation.de