Using Property.multilink instead of DerivedProperty.multilink. See #77
Removed the reset function as it is not doing anything additional that the base class (PropertySet) reset.
Removed units constructor as it has no state and it is used as a static utility class. See #54
Merge remote-tracking branch 'origin/master'
Moved the hose update code from view to model. hose observes its properties and updates itself. See #56