Fixed examples.
Changed MCMC_sims so that data frames are set up using a function and lapply rather than loops. Added code to contam_MCMC so that a rho_start value is not necessary. Set the "l" value in test_MCMC to have a default value of 1 and changed mistake so that there is a burnin for the z posterior means. Fixed simulate_genos so that genotypes are simulated correctly even when the contamination proportion is 0.
Added MCMC_allplots as function to make all plots and tables. Edited MCMC_alleleplot to include variables for the number of loci and rho value. Changed MCMC_rhoplot so that it is not specific to any set rho values. Deleted the bad graph out of MCMC_zplots and added a plot for a rho value of 0.  Changed code in allele_table so that it does not use loops to set up the data frame.