Resolve "SAAMG: Enable RectangularDomain"

Closes #543

See merge request OPAL/src!372

Resolve "Unused classes in src"

Closes #554

See merge request OPAL/src!390

Merge branch '509-orbitthreader-computemaximalimplicitdrift-not-yielding-correct-results' into 'master'

Resolve "OrbitThreader::computeMaximalImplicitDrift not yielding correct results"

Closes #509

See merge request OPAL/src!336

Resolve "Option MINBINEMITTED and MINSTEPFORREBIN not working"

Closes #571

See merge request OPAL/src!399

Merge branch '572-source-elements-should-delete-particles-that-are-pushed-back-into-it' into 'master'

Resolve "Source elements should delete particles that are pushed back into it"

Closes #572

See merge request OPAL/src!400

Merge branch '509-orbitthreader-computemaximalimplicitdrift-not-yielding-correct-results' of gitlab.psi.ch:OPAL/src into 509-orbitthreader-computemaximalimplicitdrift-not-yielding-correct-results

This reverts commit 01ef5980.

Merge branch '569-fittint-bend-angle-in-bend2d-may-run-indefinitely-in-some-circumstances' into 'master'

Resolve "fitting bend angle in Bend2D may run indefinitely in some circumstances"

Closes #569

See merge request !398

change sign such that the absolute value of the amplitude is lowered if the bending angle is too big and increased if it's too small

Resolve "Autophasing broken when fieldmap starts at z < 0"

Closes #568

See merge request OPAL/src!397

Merge remote-tracking branch 'origin/master' into 509-orbitthreader-computemaximalimplicitdrift-not-yielding-correct-results

Resolve "Matched distribution not working with SCALABLE = FALSE"

Closes #566

See merge request !395

Resolve "Matched Distribution: Not matched?"

See merge request OPAL/src!393

RealDiracMatrix: remove unused functions, change storage type of ublas vector and fix bug in function 'transform'