v1.4.1

• add absoluteError and relativeError (float or error) invert kwargs
• switch remaining modelling classes to pg.Modelling
• allow all mesh-based regularization for gravity and magnetics fops
• add Inversion.setConstraintWeights for individual weighting
• skip small eigenvalues for geostatistical regularization thus saving memory
• improve SIPSpectrum manager by better defaults and fixes
• allow for negative parameter limits (and thus negative parameters)
• enable show*(coverage=0.5/1) for global alpha-shading
• add example for 2D gravity inversion
• add RMS/chi-square explanations to enhance polyfit example
• improve 3D magnetics example by depth weighting
• add DataContainer.ensure2D to switch YZ coordinates if needed (#536)
• default createMesh with no boundary (particularly for seismics)
• createMesh now also sets mesh by default for easier workflows
• add ComplexSpectrum DataContainer-derived class for SIP, FDEM etc.
• improve MultiFrameModelling class
• improved documentation of classes and functions
• improved examples: chi2history, modelhistory, petrophysical joint inv

Full Changelog: v1.4.0...v1.4.1