CR estimator for TC

Added CR estimator for TC. Also includes loop to investigate window
width impact and then plots.
Switched CR plot type for TC

Using geom_point instead of line now
Remove var comments

removed variance comments from estimators
Bootstrap for sim

Bootstrap to find se for simulated capture recapture data. Very slow.
set seed
Rename estNmean

Changed to estN.mean
Var and MSE fix for sim

Now calculates variance and mse for each capture occasion.
Timer

added timer and some comments to track loop
se fix

changed to n-1. I think this is correct... check?
Workspace bkp after big sim loop