------
- show field_cls.metadata in reference document (edc-form-describer)
- use 'custom_name' to capture 3rd element of tuple in list_data,
if it exists. Add ListModelMixin2 and class to convert a choices
tuple to something the list_data loader can handle
(edc-list-data)
- add iter to custom Choices class (edc-model-field)
- change precision for ALP to 2 places, ALT to 2 places, magnesium to
2 places (edc-lab-results)
- update precision on equalities for magnsium, uric acid, neutrophils
(edc-reportable)