> Split constructions into each element. Now "wall_const", "roof_const",
"floor_const" and "glazing_const" are specified separately giving more
flexibility. Layers which use older versions of the plugin will need to be
updated (but old databases can remain the same).
> Added more default constructions and materials
> Changed "Commercial" use into "Office" and "Shop"
> Checks for weather file at start of process so that failure can occur before
pre-processing
> Checks for duplicate UIDs
> Changed default shading buffer radius to 20m
