Allow concatenation of properties

[VladimirAlexiev]

https://bg.wikipedia.org/wiki/Шаблон:Геообект defines a group of "other info" props. Eg (translation is also provided)

|друго-тип = [[БВП]]      # other-type  = GDP
|друго-инфо = $10 000     # other-info  = $10 000
|друго1-тип = Мин. темп.  # other1-type = min.temp
|друго1-инфо = -10°C      # other1-info = -10°C
|друго2-тип = Макс. темп. # other2-type = max.temp
|друго2-инфо = +40°C      # other2-info = +40°C

One could try to map these to proper fields and values, but that's impossible before having full enumerations of the values in otherN-type (#327 asks just for sampling, and is not yet done).

So for now I'll settle for the ability to concatenate two fields into dbo:note.