Nyall Dawson dee6f3f30d Add flag to allow a child algorithm's results to prune back the remaining model branches
When an algorithm returns this flag, and after executing it in a model it doesn't set a
certain output which remaining model algorithms depend on, then these branches are
pruned back and don't get executed for the model run.

Allows for creation of algorithms which impact the overall model flow.
2020-03-18 02:52:37 +10:00
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2019-02-27 09:41:11 +10:00