update data and pre-process scripts

.gitignore

cache/PROMISCES_CS2_PFAS_data.RData

cache/PROMISCES_CS2_PFAS_data.hash

cache/PROMISCES_CS2_PFAS_sum.RData

cache/PROMISCES_CS2_PFAS_sum.hash

cache/README.md

cache/data_combined.RData

cache/data_combined.hash

config/global.dcf

data/README.md

lib/0_globals.R

lib/1_pfas_cas_mapping.R

lib/1_ros_calculations.R

lib/2_fun_ros_modelling.R

lib/3_fun_ros_monitor_with_loq_box.R

lib/4_factor_levels.R

lib/README.md

munge/1_data_preprocess.R

munge/1_read_data.R

munge/2_read_metadata.R