removing old simulation files

data/sims/bioEU.csv

data/sims/bioEU_nopa.csv

data/sims/combined.csv

data/sims/diet_nopa.csv

data/sims/diet_pa.csv

data/sims/diet_singles_with_pa.csv

data/sims/diet_singles_without_pa.csv

data/sims/workshop.csv