validate combinations: at least two attributes required
Merge branch 'master' into develop
introduced AnnoGraphConf
applied changes to graph controller
applied changes to graph display
transferred methods from graph display to graph conf
debugging
implemented merging of graph configurations
always require toolbox module
debugging
Merge branch 'master' into develop
Merge branch 'feature/layer_as_object' into develop

Conflicts:
	lib/anno_graph.rb
	lib/graph_controller.rb
Merge branch 'master' into develop
fix: require toolbox_module in main
use before filter for routes
syntax changes
changed a lot
it basically works now
only JSON for toolbox format description
cleaned up