added get_* obs with model av incorporated, w0 routine, model_av update, fit_alg allows correlated fits, EnsInfo and some const, pvalue with warning and 1.0 safe, read_chunks for TSM. There are duplicities, CHECK. Needs checking and DOCUMENTING

corr_obs_TMS updated with gaps in measurements and automatic detection of the gaps

t0_phys changed from Bruno et al to the value from internal analysis

change md_val for TSM, seems to be working good, J501 a bit differetn phi4_sh, rework dec_const, carefull check