Resolve "compilation error with OPAL_DKS"

See merge request !178

replace getLPath and setLPath with get_sPos and set_sPos

Closes #362

See merge request !179

Conflicts:
	src/Classic/Algorithms/PartBunchBase.hpp

Resolve "Apply commit also in master"

Closes #361

See merge request !176

Resolve "Cavity cuts lines"

See merge request !170

Resolve "Wrong bunch information"

See merge request !171

Resolve "Track back in time"

Closes #353

See merge request !169

Implements tracking bunch back in time; replace queues for time step size, num time steps and zstop with class that stores all these informations in a list; let the SOURCE element absorbe all particles in case of back tracking; disables automatic centering of FROMFILE distributions;

This MR is a somewhat random collection of minor fixes that were accumulated over the past months. 
It removes several unused methods, has some minor refactoring, and improves spelling and spacing.
In particular `src/Classic/AbsBeamline/Bend2D.cpp` and `src/Elements/OpalBeamline.cpp` were cleaned.
Some of the fixes were found with the static code analysis of #62.

See merge request !168

move openMode from Options to OpalData and pass as argument for LossDataSink

See merge request !167

Resolve "Probe Output"

Closes #344

See merge request !161

Resolve "CMAKE add on NERSC"

See merge request !165

Resolve "fixes for overloaded virtual errors on macOS"

Closes #333

See merge request !155

Fix for "improve ElementPositionWriter and SDDSColumn"

Closes #348

See merge request !163

improve ElementPositionWriter and SDDSColumn

See merge request !159

 format and precision of column value output

Resolve "remove obsolete build instructions and Makefile.def's"

Closes #345

See merge request !154

Resolve "Distinguish bunches in probe"

Closes #343

See merge request !151