flav-io/flavio v1.2

• Leptonic kaon decays BR(KL->mumu), BR(KS->mumu) (as well as the electronic modes)
• Lepton flavour violating kaon decays BR(KL->emu,mue), BR(KS->emu,mue)
• π→μν total rate, Gamma(pi+->munu)
• Some additional Z and W pole observables, e.g. the LFU ratio Rmue(W->lnu)

• The B→D and B→D form factor parameters have been improved: while still using the parametrization from arXiv:1801.01112, the parameters have been updated from a fit where the LCSR input is taken from arXiv:1811.00983 rather than arXiv:0809.0222. This leads in particular to a more reliable prediction for R_D and R_D.
• Various parametric updates, e.g. quark masses are now taken from lattice QCD.
• Correlation among B meson bag parameters from FLAG now properly taken into account.
• Two-dimensional likelihoods of the CMS and ATLAS measurements of B_s,d→μμ added (thanks Peter Stangl!)

• The CKM parameter gamma has been renamed to delta to more accuretely reflect the fact that this is treated internally precisely as the Dirac phase δ. Although this is numerically almost identical with the unitarity triangle angle γ, it is not equivalent.

• Factor of 2 in tau->emue and tau->muemu fixed (thanks to Andrzej Buras!)

... and a couple of smaller fixes.