Interim generate-parcel-nr script plus tidying up of data loading scripts for Kano (more work required)

Completed interim generate-parcel-nr script but needs in the Clients GIS project control bundle class to call this BR.
Ultimately the generate-parcel-nr script needs to be reworked to shorten definition as any addition of further wards (beyond original 6)
Would exceed the 4000 character limit for BR definitions

Changed scripts to reflect ward (singular) rather than mix of ward and wards (singular and plura)

Tidied up spatial_unit_group population in load_shapefiles script so as to specifically identify the State-LGA-Ward hierarcy
and LGAs and wards as specific groups