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- setEllipsoidalMode() was removed. Ellipsoidal calculations are now enabled whenever a valid ellipsoid() has been set. Set the ellipsoid to 'NONE' to disable ellipsoidal calculations. - ellipsoidalEnabled() was removed. Ellipsoidal calculations are now enabled whenever a valid ellipsoid() is set. Check willUseEllipsoid() to determine whether ellipsoidal calculations will be performed. - sourceCrs() and setSourceCrs() now always take and return QgsCoordinateReferenceSystem objects. All string/ID based CRS methods were removed. - geographic() was removed. This was only used internally in one place, so was replaced with sourceCrs().isGeographic() instead. - some largely overlapping measurement functions were consolidated