Resolve "OrbitThreader::computeMaximalImplicitDrift not yielding correct results"

Closes #509 (closed)

src/Algorithms/CavityAutophaser.cpp

+//
+// Class CavityAutophaser
+//
+// This class determines the phase of an RF cavity for which the reference particle
+// is accelerated to the highest energy.
+//
+// Copyright (c) 2016,       Christof Metzger-Kraus, Helmholtz-Zentrum Berlin, Germany
+//               2017 - 2020 Christof Metzger-Kraus
+//
+// All rights reserved
+//
+// This file is part of OPAL.
+//
+// OPAL is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// You should have received a copy of the GNU General Public License
+// along with OPAL. If not, see <https://www.gnu.org/licenses/>.
+//
 #include "Algorithms/CavityAutophaser.h"
 #include "Algorithms/Vektor.h"
 #include "AbsBeamline/RFCavity.h"