tolerance functionality doesn't currently work

[03rcooke]

The tolerance = 3 functionality doesn't currently work. The idea is to not sample if the number of samples is close to the target amount (i.e., within the tolerance). So if we had 1000 samples and we wanted 999 we wouldn't sample from the posterior. However this fails when generating the dataframe as raw_occ$iteration <- 1:sample_n which is not the same length as the data.

I have currently set tolerance = 0 in my fork and will make this the default until we get this functionality properly working.