Alpha beta gamma test for the y3 master catalog
code/abg.py: solves the fitting problem. Defining a chisq function, for alpha,beta and delta constant
code/abg_scaledependet.py: solves system of equations for each angular bin, so alpha, beta and delta are scale dependent
code/galaxies_rstars_corr.py: computes correlations between metacal galaxies and reserved stars
code/reserved_stars_corr.py: computes autocorrelation of reserved stars