cicwi/PyCorrectedEmissionCT: Release version 0.5.1

New minor release, adding the following features and fixing the following bugs: Added Better support for FBP: Dedicated solver class. Support for 3D geometries. Use of scikit-image's filters, with rfft. Support for various padding modes (constant, edge, etc). Support for various padding modes in gradient, Laplacian and convolution operators. Support for Lorentzian and sech^2 beam shapes. Computation of Center-of-Mass for volume. ### Fixed Border behavior in convolution operator. Sanitized projector's angle input. Denoising / deconvolution method. Models: handling of astra-toolbox's 2D rotation direction