method.

renaming Collimator to CCollimator where C stands for cyclotron; all other collimators are implemented using FlexibleCollimator; This also fixes #224

Resolve "Cyclotron trim coil has discontinuous derivative"

See merge request !35

Opal maps

See merge request !37

limit length of fringe field such that the entrance and the exit fringe field of the same dipole don't overlap; This fixes #210

src/Classic/Algebra/ComplexEigen.cpp: use ssize_t instead of int in int ComplexEigen::hqr2() to avoid overflow