graphviz: fix ob.target is undefined error
graphviz: work on aggregation
graphviz: aggregation ranking
graphviz: optimize node content retrieval
graphviz : enlarge root node
graphviz : can delete nodes from graph
graphviz : can delete aggregation nodes
graphviz: begin node loading
Added safeApply to rootScope
graphviz: somewhat of a Hash::Merge
graphviz: load node relations on click
graphviz: optimize cypher request (do not retrieve <<INSTANCE>>)
grahviz: keep the right relations directions
graphviz: limit cypher query to current topic
graphviz: first shot at aggregation bubble explosion
graphviz: check that nodes aren't in the graph before putting them in an aggregation bubble
Proportional sizes