[Halld-offline] REST Format Minor Changes, Versioning?

[Paul Mattione]

I've made some minor changes to the REST format:

1) Breakup BCAL / Track DOCA into delta-phi and delta-z components (significantly different dependence)
2) Breakup TOF / Track DOCA into delta-x and delta-y components (can be significantly different (e.g. single-ended paddles))
3) Include TOF point "Status" (convolution of which bars were hit, and which ends had hits > threshold energy)

These changes are important for evaluating the quality of the hit / track matching, evaluating whether "neutral" showers might instead be parts of hadronic showers, and for matching tracks to TOF hits that don't have well-defined positions (e.g. hits in single-ended paddles that don't match to the other plane).  

However, these changes break backwards compatibility.  So you'll no longer be able to analyze (e.g.) Data-Challenge-2 data with code versions from here on.  These changes needed to be done eventually though, and I thought it was important to do them now, before we create any official REST skims of the commissioning data.  

Maybe we should start specifying/using different versioning for the REST files ... Richard, is this possible?  If you could give me some instructions and sample code early tomorrow, maybe I can implement this before we launch ...

- Paul