PlotFits: PlotFits function
In femoerman/PBPGM: Parallellised Bayesian Population Growth Models

Plots the posterior predictions on the actual data so model fit can be checked visually

1	PlotFits(fulloutput, dd, filename)

`fulloutput`	Output generated in the fitting function, containing all the posterior data from the model fitting
`dd`	Dataframe with columns for population size data (colname=popsize), time data (colname=time) and unique identifiers for each population (colname=ident)
`graphname`	Path with filename to save the figure showing the fits of the data with the posterior predictions. Defaults to NA, in which the plot will not be saved