Dwelling Number for districts with no information

Calculated dwelling numbers for districts with no information. Considered difference between building number to find the closest districts.

In the SourceBuildingNumber there is a inner join with PopulationDistribution because the BuildingNumber and DwellingNumber table has multilevel of districts and we wanted to compare the districts with no info with the ones that are at their level (i.e. the lower levels).

\approve @ds @tara

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