[Talk-GB] landuse=construction

[Thom Shannon]

There was some discussion here
http://wiki.openstreetmap.org/index.php/Proposed_features/Building_site
with little consensus

Long term major construction sites should be mapped, they do not fit the 
definition of brownfield.
One example: about 1sq mile of Liverpool has been under construction for 
the last couple of years and has at least another year to go.

I think we should start using this tag or something similar