build: replace org.jlab.plugins:trackfitter

[c-dilks]

We are only using its LineFitter, LineFitPars, and ProbChi2perNDF.

Here is a repository showing the decompiled JAR file (you must be signed in): https://code.jlab.org/dilks/jarchaeology-trackfitter

LineFitter & LineFitPars

These classes are only consumed by the reconstruction/dc module, which has its own versions of these classes already.

The decompiled trackfitter version is practically the same as our dc module's version; however, trackfitter's LineFitter.fitStatus method has double[] parameters, whereas our dc module's version has List<double> parameters, and both of these signatures are in use in practice in the dc. I'm not sure which one is actually called more often at runtime, but the double[] version is more commonly written in the source code calls.

I changed the dc module's LineFitter.fitStatus method to take double[] parameters, rather than List<double> parameters, and added an overload that takes List<double> parameters; this is more efficient than overloading the other way around since it avoids boxing in any hot loop.

ProbChi2perNDF

This class does not appear to be implemented anywhere in coatjava. I rewrote the decompiled version of this function using apache's common-math3 in a new local class with the same name, and put it in the common-tools/clas-tracking module. The edge-case handling remains the same, and is actually consistent with ROOT's TMath::Prob function.

For comparison, see the decompiled ProbChi2perNDF, which depends on ErrorFunction and GammaFunction (also within trackfitter).

Additional Changes

I also removed dead code and resolved some warnings; unused code that seems non-trivial is commented out, rather than removed.