Tidy up of data loading scripts for Kano (more work required)

Corrected errors and opacity issue with ward and lga boundaries
Corrected script loading lga and ward shapefiles from interim_data including population of spatial_unit_in_group for State-LGA-Ward hierarchy
Removed Samoa sequence deletions and inserts and create Kano sequences for the wards
Did some preliminary work for Nigeria style generate-parcel-nr business rule