[Imports] Large scale building edits in Fiwila, Zambia

[Stewart C. Russell]

Hi Bjoern,

In addition to Martin's concern about building shape:

> 4. I will then add an open location code to each building
If this is just an encoding of the building/node's location, it's
utterly redundant and shouldn't be in the map. Anything about nearby
location coded in olc:short really should be in an enclosing
boundary=administrative.

Same goes for Maidenhead grid, mapcodes, W3W, etc.

 Stewart