[HOT] Mapping buildings for HOT

[Tom Taylor]

I didn't know about the Buildings tool when I first did HOT work, so 
mapping buildings was tedious. You can get it in JOSM. Full instructions at
https://docs.google.com/document/d/1JkiL8wlvJqdVMgGxKXPzF22YzQ-S08Q31zZQna9CTMk/edit

Tom Taylor