added first_arv_location_id for tracking in hiv care table
updated cohort queries with better ordering schemes
continual enrollment query improvements
minor update to remove invalid reference in queries
minor SQL syntax error fixed
major updates to change how the table is populated or derived
added discontinue date, peds with only adult encounters and a few other minor changes
more explanatory enrollment reasons and update to ARV to ignore mother-related observations
adding last HIV encounter info, last discontinue reason and removing transferred in flag in lieu of the date being null as a flag
limiting ARVs to more than one observation, recording observation data for all and recording last HIV encounter info and discontinue info for all
removed null checks and ensured last hiv encounter shows up regardless of last discontinue date
added ARV encounters table generation task
minor formatting updates
fixed cohort definition
changed last_who_stage to a string
modified who stage to indicate A(dult) or P(eds)
updated ARV task to create two tables, current and previous, with on_ART derived column
removing unneeded IML files
modified first ARV code to look at new scratch table
minor SQL adjustments