flav-io/flavio v0.23

What's new in this release:

This release features major improvements to the likelihood profiler introduced in v0.22. Most notably, it can now make use of parallel processing, by simply passing the argument threads=N to the run method (see the API docs for details).

• The B->D and B->π form factors have been updated to use the FLAG 2017 lattice average by default
• The best_fit method to determine the best-fit point of a FastFit is now more robust (i.e., faster and less likely to fail)

• The BCL parametrization of B->P form factors has been changed such that the kinematic relation f₊(0)=f₀(0) is automatically fulfilled, by fixing the highest z-expansion parameter of f₀

• The Isgur-Wise relation for the B->P tensor form factor has been corrected
• Avoid Interpolation artifacts in contour plots (#37), thanks to Peter Stangl (@peterstangl)
• Fix to effective Wilson coefficient C₈ (#38), thanks to @haolinli1991