Exetera

* Fix: `health_status` was not being accumulated during the assessment compression phase of cleanup

* Fix: added missing value `rarely_left_the_house_but_visit_lots` to `level_of_isolation`
* Fix: added missing fields `weight_clean`, `height_clean` and `bmi_clean`

* Fix: `-po` and `-ao` options now properly export patient and assessment csvs respectively

* Fix: `day` no longer overwriting `tested_covid_positive` on assessment export
* Fix: `tested_covid_positive` output as a label instead of a number

* Change: Converted `'NA'` to `''` for csv export