Run2 patches hierarchytool update

@vchobano @mschille @bkhanji

• Increases consistency w.r.t. what is called a signal track. A track is always flagged signal if isInDecay() returns true
• Adds prefix + "fromSignal" variable which stores the fromSignal() flag of each LHCb::MCParticle
• Adds Bloom filter for faster rejection of signal tracks. The effect on the performance is not too large though, I ran one test on 15 bu2jpsik dsts and the relative improvement was 2% in runtime. But it is still an improvement and there might be channels with more tracks all together where the improvement is more significant.