Show count for duplicate, identical triggers in task network view

[mountaindude]

Add a number to the arrow/edge in task network visualization, showing number of identical triggers when they are two or more.

[mountaindude]

Impklement this by adding a new property nodeCount to each node in the network data model.
By default it should be 1, but then increased if identical edges are found between task nodes (i.e. there are multiple, identical triggers between a node and an upstream parent).

[mountaindude]