Julien's most updated code has all valence derivatives with the sign changed, so md_val needs to flip the sign. Also, the reader does not write "_d1, _d2" in the derivatives anymore for the new data files, so md_val does not look for "_d1, _d2". You need to select by hand which correlators are your valence derivatives, looking at the log file e.g.

fit_routine uses Optim
LsqFit deps removed.

ADerrors commit 9c41ec2e161e4826bfe0752be8bf2a0bc025759c 

juobs_obs added,   meff and plat_av moved to juobs_obs, Corr now includes y0,  syntax simplified(Symbol), Plots->PyPlot, LatexString support