<cstring> is missing in two source files

See merge request !443

Resolve "define and set project wide editor variables"

Closes #610

See merge request !445

- configuration files for Emacs and Vim added
- plugin for Vim added

Small fixes

See merge request !441

Resolve "Opal-T fails to write LossDataSink if executed in parallel"

Closes #585

See merge request !439

Resolve "Compile error in unit tests"

Closes #600

See merge request !434

Resolve "Update Doxygen main page"

Closes #601

See merge request !435

Resolve "remove build of Doxygen LaTeX documentation"

Closes #597

See merge request !433

Resolve "Check that element length is long relative to a time step"

Closes #349

See merge request !430

check the length of the elements and compare it with the length of a time step; check that the user inputs for DT and MAXSTEPS of the TRACK command and for L of the elements are positive values; replace the length_m member variables in the elements with method call getElementLength;

Resolve "Compile error in unit tests"

See merge request !431

Resolve "ClosedOrbitFinder/SigmaGenerator: Charge not applied correctly"

See merge request !420

Resolve "compiler errors with AMR/SAAMG enabled"

Closes #587

See merge request !421

Resolve "replace all C assert with PAssert"

Closes #589

See merge request !419

Resolve "parse error in VFFA-1.in"

Closes #584

See merge request !418

Resolve "OrbitThreader doesn't track far enough when TRACKBACK=true"

Closes #586

See merge request !414

Resolve "compiler errors with clang9"

Closes #588

See merge request !416