added restriction on “related technique” so that the property will appear for Material Entities (equipment and instruments). Made related technique visible and editable in property group overview. Put Technique into a class group (‘research’). Put SubnationalRegion into the class group “locations”. Put vivo:database in class group ‘research’ (not ero:Database).
corected a typo
Merge branch 'maint-rel-1.6' into develop