Input to PrintDecayTree

Patrick Koppenburgrequested to merge
pkoppenb-Vector into master

Change of input for PrintDecayTree: take vector of particles, which is what Hlt2 algorithms return rather than LHCb::Particles, the KeyedContainer.

This may not be needed if @apearce changes the output type of Hlt2 algorithms. Hence WIP.

Now no longer take vector.

Edited by Patrick Koppenburg

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