[Halld-offline] DDetectorMatches, REST

[Paul Mattione]

As discussed at the last offline meeting, I'm creating a new JANA object (DDetectorMatches) that will store the information regarding the matching between a time-based track and the different detector elements (BCAL, FCAL, SC, TOF).  These objects will be saved to the REST file so that the tracks don't need to be re-swimmed through the detector during the analysis stage.  

Before finalizing the format of the DDetectorMatches class and corresponding REST structure, I want to see what you guys think about them.  The idea isn't just to store the matches themselves (where matching is many <--> many), but also additional information that is needed for calculating PID confidence levels, constraining timing in a kinematic fit, and other information that may be for signal/background separation with a BDT.  

I've attached the DDetectorMatches.h header file and a modified rest.xml file with the new "detectorMatch" structure added.  Comments are included in the files.  I think the JANA object is in pretty good shape, but I think the method of pointing between matching objects in the REST file warrants some discussion.  Please let me know what you think.  

 - Paul

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