Documentation: UIDs of Original HHs and Replacement HHs in Follow Up surveys  #171

In the Baseline HH survey and FU1, 2 and 3, the Unique ID (UID) of the HH that was assigned for the survey (original HH) was captured in SCTO under unique_id_num variable. If the HH wasn't available, the enumerators submitted the form after marking the HH as unavailable.
In the new form, they filled the UID of the replaced HH under Unique_id and selected that the HH was a replacement HH and entered the UID of the Original HH under replacement_id.
To avoid confusion from the datasets, dropped the replacement IDs in the final FU dataset after running all quality checks to ensure that the replacement ID and the unique_id are not same.