* Added an optional parameter `UseColumnNames` to the
  `ElectricCSVAdaptor2D` and `MagneticCSVAdaptor2D`
  guiding field models.
* Implemented a new electric guiding field model `ThinWire`.
* Implemented an additional check for the `TrajectoryRecorder` model
  to ensure that it correctly rejects references to non-existing particles.
* Added a new command line tool `vipm-plot-ddcs`.
* Added a new command line tool `vipm-plot-em-fields-combined`.
* Deprecated usage of the alias `vipm-plot-em-fields` as this tool
  only takes into account the beam fields but not the guiding fields and,
  thus, that name is ambiguous.
  A new alias `vipm-plot-beam-fields` has been added which refers to the
  same tool and should be used instead.