prevent error when vertex_names object has not been created yet
begin adding ui for MCMC options
update mcmc options values when default box is checked. link burnin value to interval value
add mcmc options to call to ergm
display code on data page
only display 3 sig digits in simulation coefficients
output a summary of simulation stats when running 10 or more sims
download simulation statistics
set up simulation page for new plots
plot of simulation stats (no legend yet)
added legend for simstatsplot
added tooltip to simstatsplot and updated helper box for simulation page
added download option for simstatsplot
re-size degree and geodesic distribution plot downloads
added tooltip for term documentation button
formatted fit page to allow for more ergm controls
add option to type in more MCMC controls
edit tooltips
add ui for control.simulate options
MCMC controls