Calculate F_ST from matrix
Arguments
- m
- matrix output from - dist_genealogy()or- dist_vaf()
- sample_sizes
- cell numbers of each region 
Details
fst calculates Hudson's F_ST estimator.
- theta: Weir and Cockerham (1984); Weir and Hill (2002). 
- N_ST: Lynch and Crease (1990). 
- <F_ST>: Hudson, Slatkin, and Maddison (1992) Genetics. 
gst calculates Nei's F_ST estimator.
- G_ST, gamma_ST: Nei (1973, 1977, 1982). 
- K_ST: Hudson, Boos, and Kaplan (1992) MBE.