[Halld-offline] event-number-dependent calibration

[Mark M. Ito]

David,

I had a thought: I remember in G7 they had some kind of problem with the 
tagger(?) where they had to apply a different correction for different 
sections of a single run. This had to be done with some ad-hoc system of 
course. We might think about this since we are starting from scratch: is 
there some way to apply calibrations constants that vary within a run. I 
think you would want to have this as a non-default feature, something 
that only exists if needed.

Just wanted to add that to the feature wish list. Something to think 
about at least.

   -- Mark