Clean bad AHDC hits and use ATOF wedges in the Kalman Filter

[ftouchte]

Features:

• Make the Kalman Filter reusable (store error covariance matrix in Track)
• Add a routine to clean bad AHDC hits
• Use ATOF wedge in the Kalman Filter
• Extends AHDC::kftrack
• Convenient use of the PID in RungeKutta.java

Code consistency:

• Create an interface for the hits used by the Kalman Filter : KFHit
  • AHDC hits are stored in the usual Hit
  • beamline, ATOF wedges/bars are stored in RadialKFHit
  • the method KFitter.correct() no longer needs to explicitly check if we works with an AHDC hits or not: the polymorphism do the job for use
• Remove redundancy : KFitter does not use another Stepper in its constructor (the initial Stepper and the initial state are linked)

This pull request is the sync version of this draft : #1117

In coatjava development

This PR

[ftouchte]

Hello everyone, this pull request is ready for review.

I'm waiting for this PR to get validated before submitting the next one about the alignment: #1310

[mathieuouillon]

I've added a few comments. Sorry, I forgot to send them.