A small issue about user Pset

[avicomartin]

Hi all, I continue testing BIM Workbench and find a issue with user pset. If you try to modify object properties from toolbar button, you can acces to user psets but if you want to modify objects properties from combo view (double click the object in combo view tree and click "Edit IFC properties" button, user psets are not available.

[yorikvanhavre]

A whole redesign of the properties manager is planned with #81