Bugfix/blips on empty events

[Jjm321814]

A few bugs existed in old versions of blip reco

1. Running blipreco on mostly empty event displays (somewhat common in simple MC productions of single neutrino events) would lead to empty hit collections being accessed and a subsequent memory issue/crash (Not specifically a segfault though).
2. A few blip-related hitcluster variables were not copying quite correctly. Effected variables are blip.clusters[i].blipID, and blip.clusters[i].isMatched, which both had default values. The independently saved clusters objects were correctly updated.
3. The MC truth PDG values for blip-energy deposits have puzzling labels and need their evaluation looked into.

The first bug was related to a hardcoded hitHandleGH label, which looked at gaushit rather than specialBlipGausHit. On ~emtpy events the lower threshold (specialBlipGausHit) will have a few entries, but the code uses hitHandleGH for truth matching, and that higher threshold hit collection can be empty. That leads to crashes.
For now the hardcoded label is just updated to accommodate specialBlipGausHit.

The second bug is not critical, as access hitclusters this way is done through a blip, so the ID is the same as the blip you are looking at and the clusters included must be matched (into this blip). The hitcluster collection values are updated after the struct assignment (copy constructor), so I updated the blip alg to also update the blip.Cluster[i].blipID, and isMatched.

The third bug I am still digging into. I was worried that the switch from sim::energy_deposition to sim::channel->IDE was causing issues, but in the new arrangement (with an optional interface to use either) gives consistent results between them.

I have some notes I can build into slides for the first two but would like to spend a little more time on the third bug.