added tests to ZeroWeightedDistributions, removed vector rand function cause it was wrong, but we don't use it in the simulations anyway

app dynamics and opinion dynamics done, I think? people seem to rapidly switch opinions which is probably wrong

merge IntervalsModel into CovidAlertVaccinationModel, dependecies are too tight to manage as too packages easily

Update IntervalsModel/network-data/POLYMOD/Duration-priors.py, IntervalsModel/network-data/POLYMOD/Frequency-distribution.py, IntervalsModel/network-data/POLYMOD/mixing_loc-freq.csv files
Deleted IntervalsModel/network-data/POLYMOD/AALfreqdist.csv

Update IntervalsModel/network-data/POLYMOD/Duration-priors.py, IntervalsModel/network-data/POLYMOD/Frequency-distribution.py, IntervalsModel/network-data/POLYMOD/AALPoisPriors.csv, IntervalsModel/network-data/POLYMOD/AALfreqdist.csv files

Durations-priors updated a few ways.

First, corrected problems with symmetrizing the data. Changes priors 

Second, added frequency distributions with 3 bins

added new parameter to resample distributions for many repetitions in error function, symmetric priors simulation done